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+# Required Browser Features
+
+## <a id="canvas"></a>CANVAS element is present
+
+Support of the CANVAS element and "2d" context is required feature for PDF.js.
+No emulation of the CANVAS element is provided in browsers that do not support it.
+
+
+## <a id="get-literal"></a>get-literal properties
+
+The core library defines property using 'get' literal.
+Browsers that don't understand this syntax will not be able to execute the code.
+
+
+## <a id="addEventListener"></a>addEventListener is present
+
+The `addEventListener` method for DOM elements is used to bind event listeners.
+No emulation of the `addEventListener` method is provided in browsers that do not support it.
+
+
+## <a id="Uint8Array"></a><a id="Uint16Array"></a><a id="Int32Array"></a><a id="Float32Array"></a><a id="Float64Array"></a>Typed arrays are present
+
+The `Uint8Array`, `Uint16Array`, `Int32Array`, `Float32Array` and `Float64Array` will be replaced
+by the artificial TypedArray object if those types are not implemented natively.
+Only `subarray`, `buffer` and `byteLength` are similated. The `subarray` just clones the array.
+The Uint8Array also has the `set` method.
+
+
+If the `Float32Array` native implementation exists, then it will be used instead of `Float64Array`.
+
+
+## <a id="Object-create"></a>Object.create() is present
+
+The `Object.create` method will be added to the `Object` function if native implementation is absent.
+
+
+## <a id="Object-defineProperty"></a>Object.defineProperty() is present
+
+
+The `Object.defineProperty` method will be added to the `Object` function if native implementation is absent. The `__defineGetter__` / `__defineSetter__` will be used instead.
+
+
+## <a id="Object-defineProperty-DOM"></a>Object.defineProperty() can be used with DOM objects
+
+Some browsers do not allow using the `Object.defineProperty` with DOM objects.
+In this case, the `Object.defineProperty` be replaced by the artificial one. See [Object.defineProperty() is present](#Object-defineProperty)".
+
+
+## <a id="get-literal-redefine"></a>Defined via get-literal properties can be redefined
+
+Some browsers does not allow redefine properties defined with get literal by the `Object.defineProperty`.
+In this case, the `Object.defineProperty` be replaced by the artificial one. See [Object.defineProperty() is present](#Object-defineProperty)".
+
+
+## <a id="Object-keys"></a>Object.keys() is present
+
+The `Object.keys` method will be added to the `Object` function if the native implementation is absent.
+
+
+## <a id="FileReader"></a>FileReader is present
+
+The live PDF.js demo will not be able to read local file.
+
+
+## <a id="FileReader-readAsArrayBuffer"></a>FileReader.prototype.readAsArrayBuffer() is present
+
+Older browsers has no `readAsArrayBuffer` method implementation: the `readAsBinaryString` will be used instead.
+
+
+## <a id="XMLHttpRequest-overrideMimeType"></a>XMLHttpRequest.prototype.overrideMimeType() is present
+
+The empty `overrideMimeType` method will be added to the `XMLHttpRequest.prototype`, if the browser does not support it.
+
+
+## <a id="XMLHttpRequest-response"></a>XMLHttpRequest.prototype.response is present
+
+The `response` getter will be added to the `XMLHttpRequest.prototype`, if the browser does not support it.
+This is important for retrieving the binary PDF data using XHR.
+
+
+## <a id="bota"></a>btoa() is present
+
+The `btoa` will be added to the window object, if the browser does not support it.
+
+
+## <a id="Function-bind"></a>Function.prototype.bind is present
+
+The `bind` method will be added to the `Function.prototype`, if the browser does not support it.
+
+
+## <a id="dataset"></a>dataset is present for HTML element
+
+The `dataset` property will be added to the `HTMLElement.prototype`, if the browser does not support it.
+This is important for specifying addition information (e.g. for test selection layer)
+attached to specific HTML DOM element.
+
+
+## <a id="classList"></a>classList is present for HTML element
+
+The `classList` property will be added to the `HTMLElement.prototype`, if the browser does not support it.
+This is important to simplify the viewer implementation.
+
+
+## <a id="console"></a>console object is present
+
+The `console` object will be added to the window object with empty `log` and `error` methods,
+if the browser does not support it. This is important for output of the error message.
+
+
+## <a id="console-log-bind"></a>console.log is a bind-able function
+
+The `console.log` and `.error` functions will be replaced, if the browser does not allow to use
+the bind method with these functions.
+
+
+## <a id="navigator-language"></a>navigator.language is present
+
+The language getter will be added to the window.navigator object, if the browser does not support it.
+
+
+## <a id="fillRule-evenodd"></a>evenodd fill rule is supported
+
+Some PDF content is using "even-odd" fill rule/method. The content will not be displayed
+properly if this function is not supported.
+
+## <a id="dash-array"></a>dashed lined is supported
+
+Some PDF content is using custom dash line styles. The content will not be displayed
+properly if this function is not supported.
+
+
+## <a id="font-face"></a>@font-face is supported/enabled
+
+Most of PDF documents are using embedded fonts. If the browser does not support `@font-face`
+style rule, the document will not be displayed property.
+
+
+## <a id="font-face-sync"></a>@font-face data URLs are loaded synchronously
+
+The PDF.js shall wait some time before using fonts with CANVAS,
+if the browser cannot load custom fonts via `@font-face`, that are specified as data URLs, synchronously.
+
+
+## <a id="Worker"></a>Worker is supported/enabled
+
+The PDF.js will execute all code (even long running) on the main thread,
+if the browser does not support web workers. 
+
+## <a id="Worker-Uint8Array"></a>Worker can receive/send typed arrays
+
+The PDF.js will execute all code on the main thread,
+if the browser cannot send (large) typed arrayed to web workers. 
+