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This commit moves all the logic to scale up&down `<span>`s in the text layer, introduced in #18283, to CSS. The motivation for this change is that #18283 is still not enough for all cases. That PR fixed the problem in Chrome&Firefox desktop, which allow users to set an actual minimum font size in the browser settings. However, other browsers (e.g. the Chrome-based WebView on Android) have more complex logic and they scale up small text rather than simply applying a minimum. A workaround for that behavior is probably out of scope for PDF.js itself as it only affects not officially supported platforms. However, having access to the actual expected font height (through `--font-height`) allows embedders of PDF.js to implement a workaround by themselves.