Summary: Return "normal" for line-height's resolved value (the value
returned from getComputedStyle()) rather than a concrete pixel value, if
the computed value is "normal".
This aligns us with Blink, and seems the best option according to
various working group discussions, see below. In particular, normal maps
to something that is not completely representable by pixel values.
This change has been on Nightly and Beta 69 without any known issues
other than internal consumers (the fonts panel and thunderbird).
Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1579624
Standard: CSSWG resolution in
https://github.com/w3c/csswg-drafts/issues/4249
Platform coverage: All
Preference: layout.css.line-height.normal-as-resolved-value.enabled
DevTools bug: N/A, this works fine in inspector, and required a fix to
the fonts panel that landed long ago.
Other browsers: Blink matches this change, WebKit matches (some version
of) current Gecko behavior.
WPT: Added with the implementation in bug 1536871.
Secure contexts: N/A
Is this feature enabled by default in sandboxed iframes? Yes
-- Emilio
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