mirror of
https://github.com/mozilla/pdf.js.git
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615 lines
19 KiB
JavaScript
615 lines
19 KiB
JavaScript
/* Copyright 2021 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import {
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awaitPromise,
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closePages,
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loadAndWait,
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waitForPageRendered,
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} from "./test_utils.mjs";
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const isStructTreeVisible = async page => {
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await page.waitForSelector(".structTree");
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return page.evaluate(() => {
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let elem = document.querySelector(".structTree");
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while (elem) {
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if (elem.getAttribute("aria-hidden") === "true") {
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return false;
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}
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elem = elem.parentElement;
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}
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return true;
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});
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};
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describe("accessibility", () => {
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describe("structure tree", () => {
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let pages;
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beforeEach(async () => {
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pages = await loadAndWait("structure_simple.pdf", ".structTree");
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});
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afterEach(async () => {
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await closePages(pages);
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});
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it("must build structure that maps to text layer", async () => {
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await Promise.all(
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pages.map(async ([browserName, page]) => {
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expect(await isStructTreeVisible(page))
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.withContext(`In ${browserName}`)
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.toBeTrue();
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// Check the headings match up.
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const head1 = await page.$eval(
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".structTree [role='heading'][aria-level='1'] span",
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el =>
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document.getElementById(el.getAttribute("aria-owns")).textContent
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);
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expect(head1).withContext(`In ${browserName}`).toEqual("Heading 1");
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const head2 = await page.$eval(
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".structTree [role='heading'][aria-level='2'] span",
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el =>
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document.getElementById(el.getAttribute("aria-owns")).textContent
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);
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expect(head2).withContext(`In ${browserName}`).toEqual("Heading 2");
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// Check the order of the content.
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const texts = await page.$$eval(".structTree [aria-owns]", nodes =>
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nodes.map(
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el =>
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document.getElementById(el.getAttribute("aria-owns"))
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.textContent
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)
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);
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expect(texts)
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.withContext(`In ${browserName}`)
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.toEqual([
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"Heading 1",
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"This paragraph 1.",
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"Heading 2",
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"This paragraph 2.",
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]);
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})
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);
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});
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it("must check that the struct tree is still there after zooming", async () => {
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await Promise.all(
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pages.map(async ([browserName, page]) => {
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for (let i = 0; i < 8; i++) {
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expect(await isStructTreeVisible(page))
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.withContext(`In ${browserName}`)
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.toBeTrue();
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const handle = await waitForPageRendered(page);
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await page.click(`#zoom${i < 4 ? "In" : "Out"}Button`);
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await awaitPromise(handle);
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}
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})
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);
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});
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});
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describe("Annotation", () => {
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let pages;
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beforeEach(async () => {
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pages = await loadAndWait(
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"tracemonkey_a11y.pdf",
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".textLayer .endOfContent"
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);
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});
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afterEach(async () => {
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await closePages(pages);
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});
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function getSpans(page) {
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return page.evaluate(() => {
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const elements = document.querySelectorAll(
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`.textLayer span[aria-owns]:not([role="presentation"])`
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);
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const results = [];
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for (const element of elements) {
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results.push(element.innerText);
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}
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return results;
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});
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}
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it("must check that some spans are linked to some annotations thanks to aria-owns", async () => {
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await Promise.all(
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pages.map(async ([browserName, page]) => {
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const spanContents = await getSpans(page);
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expect(spanContents)
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.withContext(`In ${browserName}`)
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.toEqual(["Languages", "@intel.com", "Abstract", "Introduction"]);
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})
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);
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});
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});
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describe("Annotations order", () => {
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let pages;
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beforeEach(async () => {
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pages = await loadAndWait("fields_order.pdf", ".annotationLayer");
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});
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afterEach(async () => {
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await closePages(pages);
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});
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it("must check that the text fields are in the visual order", async () => {
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await Promise.all(
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pages.map(async ([browserName, page]) => {
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const ids = await page.evaluate(() => {
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const elements = document.querySelectorAll(
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".annotationLayer .textWidgetAnnotation"
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);
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const results = [];
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for (const element of elements) {
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results.push(element.getAttribute("data-annotation-id"));
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}
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return results;
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});
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expect(ids)
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.withContext(`In ${browserName}`)
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.toEqual(["32R", "30R", "31R", "34R", "29R", "33R"]);
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})
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);
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});
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});
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describe("Stamp annotation accessibility", () => {
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let pages;
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beforeEach(async () => {
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pages = await loadAndWait(
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"tagged_stamp.pdf",
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".annotationLayer #pdfjs_internal_id_21R"
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);
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});
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afterEach(async () => {
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await closePages(pages);
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});
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it("must check the id in aria-controls", async () => {
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await Promise.all(
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pages.map(async ([browserName, page]) => {
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await page.waitForSelector(".annotationLayer");
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const stampId = "pdfjs_internal_id_20R";
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await page.click(`#${stampId}`);
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const controlledId = await page.$eval(
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"#pdfjs_internal_id_21R",
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el => document.getElementById(el.getAttribute("aria-controls")).id
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);
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expect(controlledId)
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.withContext(`In ${browserName}`)
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.toEqual(stampId);
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})
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);
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});
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it("must check the aria-label linked to the stamp annotation", async () => {
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await Promise.all(
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pages.map(async ([browserName, page]) => {
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await page.waitForSelector(".annotationLayer");
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const ariaLabel = await page.$eval(
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".annotationLayer section[role='img']",
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el => el.getAttribute("aria-label")
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);
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expect(ariaLabel)
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.withContext(`In ${browserName}`)
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.toEqual("Secondary text for stamp");
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})
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);
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});
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it("must check that the stamp annotation is linked to the struct tree", async () => {
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await Promise.all(
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pages.map(async ([browserName, page]) => {
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await page.waitForSelector(".structTree");
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const isLinkedToStampAnnotation = await page.$eval(
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".structTree [role='figure']",
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el =>
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document
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.getElementById(el.getAttribute("aria-owns"))
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.classList.contains("stampAnnotation")
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);
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expect(isLinkedToStampAnnotation)
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.withContext(`In ${browserName}`)
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.toEqual(true);
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})
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);
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});
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});
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describe("Figure in the content stream", () => {
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let pages;
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beforeEach(async () => {
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pages = await loadAndWait("bug1708040.pdf", ".textLayer");
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});
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afterEach(async () => {
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await closePages(pages);
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});
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it("must check that an image is correctly inserted in the text layer", async () => {
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await Promise.all(
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pages.map(async ([browserName, page]) => {
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expect(await isStructTreeVisible(page))
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.withContext(`In ${browserName}`)
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.toBeTrue();
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const spanId = await page.evaluate(() => {
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const el = document.querySelector(
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`.structTree span[role="figure"]`
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);
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return el.getAttribute("aria-owns") || null;
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});
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expect(spanId).withContext(`In ${browserName}`).not.toBeNull();
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const ariaLabel = await page.evaluate(id => {
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const img = document.querySelector(`#${id} > span[role="img"]`);
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return img.getAttribute("aria-label");
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}, spanId);
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expect(ariaLabel)
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.withContext(`In ${browserName}`)
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.toEqual("A logo of a fox and a globe");
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})
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);
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});
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});
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describe("No undefined id", () => {
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let pages;
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beforeEach(async () => {
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pages = await loadAndWait("issue20102.pdf", ".textLayer");
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});
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afterEach(async () => {
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await closePages(pages);
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});
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it("must check that span hasn't an 'undefined' id", async () => {
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await Promise.all(
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pages.map(async ([browserName, page]) => {
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const id = await page.$eval("span.markedContent", span => span.id);
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expect(id).withContext(`In ${browserName}`).toBe("");
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})
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);
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});
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});
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describe("MathML in AF entry from LaTeX", () => {
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let pages;
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beforeEach(async () => {
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pages = await loadAndWait("bug1937438_af_from_latex.pdf", ".textLayer");
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});
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afterEach(async () => {
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await closePages(pages);
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});
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it("must check that the MathML is correctly inserted", async () => {
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await Promise.all(
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pages.map(async ([browserName, page]) => {
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const isSanitizerSupported = await page.evaluate(() => {
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try {
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// eslint-disable-next-line no-undef
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return typeof Sanitizer !== "undefined";
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} catch {
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return false;
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}
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});
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if (isSanitizerSupported) {
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const mathML = await page.$eval(
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"span.structTree span[aria-owns='p58R_mc13'] > math",
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el => el?.innerHTML ?? ""
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);
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expect(mathML)
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.withContext(`In ${browserName}`)
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.toEqual(
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` <msqrt><msup><mi>x</mi><mn>2</mn></msup></msqrt> <mo>=</mo> <mrow intent="absolute-value($x)"><mo>|</mo><mi arg="x">x</mi><mo>|</mo></mrow> `
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);
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// Check that the math corresponding element is hidden in the text
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// layer.
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const ariaHidden = await page.$eval("span#p58R_mc13", el =>
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el.getAttribute("aria-hidden")
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);
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expect(ariaHidden).withContext(`In ${browserName}`).toEqual("true");
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} else {
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// eslint-disable-next-line no-console
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console.log(
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`Pending in Chrome: Sanitizer API (in ${browserName}) is not supported`
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);
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}
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})
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);
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});
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});
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describe("MathML with some attributes in AF entry from LaTeX", () => {
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let pages;
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beforeEach(async () => {
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pages = await loadAndWait("bug1997343.pdf", ".textLayer");
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});
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afterEach(async () => {
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await closePages(pages);
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});
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it("must check that the MathML is correctly inserted", async () => {
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await Promise.all(
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pages.map(async ([browserName, page]) => {
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const isSanitizerSupported = await page.evaluate(() => {
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try {
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// eslint-disable-next-line no-undef
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return typeof Sanitizer !== "undefined";
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} catch {
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return false;
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}
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});
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if (isSanitizerSupported) {
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const mathML = await page.$eval(
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"span.structTree span[aria-owns='p21R_mc64']",
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el => el?.innerHTML ?? ""
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);
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expect(mathML)
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.withContext(`In ${browserName}`)
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.toEqual(
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'<math display="block"> <msup> <mi>𝑛</mi> <mi>𝑝</mi> </msup> <mo lspace="0.278em" rspace="0.278em">=</mo> <mi>𝑛</mi> <mspace width="1.000em"></mspace> <mi> mod </mi> <mspace width="0.167em"></mspace> <mspace width="0.167em"></mspace> <mi>𝑝</mi> </math>'
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);
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} else {
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// eslint-disable-next-line no-console
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console.log(
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`Pending in Chrome: Sanitizer API (in ${browserName}) is not supported`
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);
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}
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})
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);
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});
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});
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describe("MathML tags in the struct tree", () => {
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let pages;
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beforeEach(async () => {
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pages = await loadAndWait("bug1937438_mml_from_latex.pdf", ".textLayer");
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});
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afterEach(async () => {
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await closePages(pages);
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});
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it("must check that the MathML is correctly inserted", async () => {
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await Promise.all(
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pages.map(async ([browserName, page]) => {
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const mathML = await page.$eval(
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"span.structTree span[role='group'] span[role='group']:last-child > span math",
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el => el?.innerHTML ?? ""
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);
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expect(mathML)
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.withContext(`In ${browserName}`)
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.toEqual(
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`<mi aria-owns="p76R_mc16">𝑐</mi><mo aria-owns="p76R_mc17">=</mo><msqrt><mrow><msup><mi aria-owns="p76R_mc18">𝑎</mi><mn aria-owns="p76R_mc19">2</mn></msup><mo aria-owns="p76R_mc20">+</mo><msup><mi aria-owns="p76R_mc21">𝑏</mi><mn aria-owns="p76R_mc22">2</mn></msup></mrow></msqrt>`
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);
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const ariaHidden = await page.$eval("span#p76R_mc16", el =>
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el.getAttribute("aria-hidden")
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);
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expect(ariaHidden).withContext(`In ${browserName}`).toEqual("true");
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})
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);
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});
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});
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describe("Artifacts must be aria-hidden", () => {
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let pages;
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beforeEach(async () => {
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pages = await loadAndWait("bug1937438_mml_from_latex.pdf", ".textLayer");
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});
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afterEach(async () => {
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await closePages(pages);
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});
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it("must check that some artifacts are aria-hidden", async () => {
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await Promise.all(
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pages.map(async ([browserName, page]) => {
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const parentSquareRootHidden = await page.evaluate(() => {
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for (const span of document.querySelectorAll(".textLayer span")) {
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if (span.textContent === "√") {
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return span.parentElement.getAttribute("aria-hidden");
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}
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}
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return false;
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});
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expect(parentSquareRootHidden)
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.withContext(`In ${browserName}`)
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.toEqual("true");
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})
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);
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});
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});
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describe("No alt-text with MathML", () => {
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let pages;
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beforeEach(async () => {
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pages = await loadAndWait("bug2004951.pdf", ".textLayer");
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});
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afterEach(async () => {
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await closePages(pages);
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});
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it("must check that there's no alt-text on the MathML node", async () => {
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await Promise.all(
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pages.map(async ([browserName, page]) => {
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const isSanitizerSupported = await page.evaluate(() => {
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try {
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// eslint-disable-next-line no-undef
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return typeof Sanitizer !== "undefined";
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} catch {
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return false;
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}
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});
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const ariaLabel = await page.$eval(
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"span[aria-owns='p3R_mc2']",
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el => el.getAttribute("aria-label") || ""
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);
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if (isSanitizerSupported) {
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expect(ariaLabel).withContext(`In ${browserName}`).toEqual("");
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} else {
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expect(ariaLabel)
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.withContext(`In ${browserName}`)
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.toEqual("cube root of , x plus y end cube root ");
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}
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})
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);
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});
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});
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describe("Text elements must be aria-hidden when there's MathML and annotations", () => {
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let pages;
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beforeEach(async () => {
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pages = await loadAndWait("bug2009627.pdf", ".textLayer");
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});
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afterEach(async () => {
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await closePages(pages);
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});
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it("must check that the text in text layer is aria-hidden", async () => {
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await Promise.all(
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pages.map(async ([browserName, page]) => {
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const isSanitizerSupported = await page.evaluate(() => {
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try {
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// eslint-disable-next-line no-undef
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return typeof Sanitizer !== "undefined";
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} catch {
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return false;
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}
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});
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const ariaHidden = await page.evaluate(() =>
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Array.from(
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document.querySelectorAll(".structTree :has(> math)")
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).map(el =>
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document
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.getElementById(el.getAttribute("aria-owns"))
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.getAttribute("aria-hidden")
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)
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);
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if (isSanitizerSupported) {
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expect(ariaHidden)
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.withContext(`In ${browserName}`)
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.toEqual(["true", "true", "true"]);
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} else {
|
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// eslint-disable-next-line no-console
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console.log(
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`Pending in Chrome: Sanitizer API (in ${browserName}) is not supported`
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);
|
||
}
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})
|
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);
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});
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});
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describe("A TH in a TR itself in a TBody is rowheader", () => {
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let pages;
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beforeEach(async () => {
|
||
pages = await loadAndWait("bug2014080.pdf", ".textLayer");
|
||
});
|
||
|
||
afterEach(async () => {
|
||
await closePages(pages);
|
||
});
|
||
|
||
it("must check that the table has the right structure", async () => {
|
||
await Promise.all(
|
||
pages.map(async ([browserName, page]) => {
|
||
let elementRole = await page.evaluate(() =>
|
||
Array.from(
|
||
document.querySelector(".structTree [role='table']").children
|
||
).map(child => child.getAttribute("role"))
|
||
);
|
||
|
||
// THeader and TBody must be rowgroup.
|
||
expect(elementRole)
|
||
.withContext(`In ${browserName}`)
|
||
.toEqual(["rowgroup", "rowgroup"]);
|
||
|
||
elementRole = await page.evaluate(() =>
|
||
Array.from(
|
||
document.querySelector(
|
||
".structTree [role='table'] > [role='rowgroup'] > [role='row']"
|
||
).children
|
||
).map(child => child.getAttribute("role"))
|
||
);
|
||
|
||
// THeader has 3 columnheader.
|
||
expect(elementRole)
|
||
.withContext(`In ${browserName}`)
|
||
.toEqual(["columnheader", "columnheader", "columnheader"]);
|
||
|
||
elementRole = await page.evaluate(() =>
|
||
Array.from(
|
||
document.querySelector(
|
||
".structTree [role='table'] > [role='rowgroup']:nth-child(2)"
|
||
).children
|
||
).map(child => child.getAttribute("role"))
|
||
);
|
||
|
||
// TBody has 5 rows.
|
||
expect(elementRole)
|
||
.withContext(`In ${browserName}`)
|
||
.toEqual(["row", "row", "row", "row", "row"]);
|
||
|
||
elementRole = await page.evaluate(() =>
|
||
Array.from(
|
||
document.querySelector(
|
||
".structTree [role='table'] > [role='rowgroup']:nth-child(2) > [role='row']:first-child"
|
||
).children
|
||
).map(child => child.getAttribute("role"))
|
||
);
|
||
// First row has a rowheader and 2 cells.
|
||
expect(elementRole)
|
||
.withContext(`In ${browserName}`)
|
||
.toEqual(["rowheader", "cell", "cell"]);
|
||
})
|
||
);
|
||
});
|
||
});
|
||
});
|