https://bugzilla.wikimedia.org/show_bug.cgi?id=45810
Web browser: ---
Bug ID: 45810
Summary: [Regression] mw.loader.addEmbeddedCSS causes repaints
when changing stylesheets
Product: MediaWiki
Version: 1.18
Hardware: All
OS: All
Status: NEW
Severity: major
Priority: Unprioritized
Component: ResourceLoader
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected]
Classification: Unclassified
Mobile Platform: ---
By default we should always create a new <style> tag.
Appending text to a <style> tag means the contents have to be re-parsed.
Not by the DOM, but for the stylesheet, since the CSS parser can't continue
after it ended (it could be left it an open bracket state etc.)
As a result, the browser may have to do various re-paints which are a
significant slowdown.
We originally did this "right", but to address the IE stylesheet limit (bug
31676) we changed it to appending text nodes. We should change it back to the
right way and only do this hack for IE <= 9.
Modern browsers shouldn't suffer from it.
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