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8bea1dec18
The spec requires that CSS variable values are trimmed. In browsers that do
this - mainly, Safari, but also Firefox if the value only has leading
whitespace - we currently return undefined; in other browsers, we return
an empty string as the logic to fall back to undefined happens before
trimming.
This commit adds another explicit callback to `undefined` to have it consistent
across browsers.
Also, more explicit comments about behaviors we need to work around in various
browsers have been added.
Closes gh-5120
Ref gh-5106
(cherry picked from commit
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| data | ||
| integration | ||
| node_smoke_tests | ||
| promises_aplus_adapters | ||
| unit | ||
| .eslintrc.json | ||
| delegatetest.html | ||
| hovertest.html | ||
| index.html | ||
| jquery.js | ||
| karma.context.html | ||
| karma.debug.html | ||
| localfile.html | ||
| middleware-mockserver.js | ||
| networkerror.html | ||
| xhtml.php | ||