Support for expressing CSS lengths relative to the line-height
There is a wish/need to use the lh unit to size textareas to fit a given number of lines of text. See .  https://github.com/w3c/csswg-drafts/issues/7542
Does this intent deprecate or change behavior of existing APIs, such that it has potentially high risk for Android WebView-based applications?
The new unit should be automatically supported by devtools. No need for any changes.
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