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Bug 1909773 part 4: Add support for '-webkit-fill-available' as an alias for the CSS 'stretch' behavior (off-by-default for now). r=emilio

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Both '-webkit-fill-available' and 'stretch' are equivalent to '-moz-available'
at this point in the patch series, and both are off-by-default, because
actually supporting them would require that we add special logic to handle them
as block-axis sizes (which I'll do in a separate bug).

Differential Revision: https://phabricator.services.mozilla.com/D217687
This commit is contained in:
Daniel Holbert
2024-07-25 18:18:24 +00:00
parent 6bdbaba6b7
commit a8c637281f
11 changed files with 56 additions and 11 deletions
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12
layout/style/nsComputedDOMStyle.cpp
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@@ -2113,8 +2113,18 @@ static void SetValueToExtremumLength(nsROCSSPrimitiveValue* aValue,
return aValue->SetString("min-content");
case nsIFrame::ExtremumLength::MozAvailable:
return aValue->SetString("-moz-available");
case nsIFrame::ExtremumLength::Stretch:
case nsIFrame::ExtremumLength::Stretch: {
// By default we serialize this value using the standard "stretch"
// keyword. The exception is when that keyword is explicitly preffed off
// and the legacy "-webkit-fill-available" keyword is preffed on; in
// that case, we serialize to the legacy webkit-prefixed alias, to
// ensure that we can round-trip properly.
if (!StaticPrefs::layout_css_stretch_size_keyword_enabled() &&
StaticPrefs::layout_css_webkit_fill_available_enabled()) {
return aValue->SetString("-webkit-fill-available");
}
return aValue->SetString("stretch");
}
case nsIFrame::ExtremumLength::FitContent:
return aValue->SetString("fit-content");
case nsIFrame::ExtremumLength::FitContentFunction: