This tracks an offset along with the ratio for the keyword font size
data. The offset gets used when a calc is involved whilst inheriting
font-size (it is the computed value of that calc ignoring em/percentage
portions, which go into the ratio). If the family or language changes,
the new font size can be computed by taking the keyword's size in the context
of that family/language, multiplying it by the ratio, and adding the
offset.
Added direct link to Visual Studio Community
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Update rust-cssparser to 0.20.2.
This reduces memory consumption of list-valued properties in the common case of one entry in the list.
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TEST: fix and add case of po-observe.any.js
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1. implementing step 3 from the [`PerformanceObserver.observe()`](https://w3c.github.io/performance-timeline/#dom-performanceobserver-observe()) method spec properly.
2. also add cases about step 1 & 2
work on the top of #18283
r? @ferjm
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Bug 1395064 - stylo: Add uses of fallible Vec, SmallVec and HashMap f…
…acilities. r=emilio@crisal.io.
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