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LibWeb: Set flex-basis to 0% when omitted from flex shorthand

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This doesn't match the spec, *but* matches what other engines do, and it
turns out this is required for web compat. (It fixes the menu on MDN.)
This commit is contained in:
Andreas Kling 2023-06-07 17:16:49 +02:00
parent dd2080c55f
commit 102b8d717f
3 changed files with 59 additions and 4 deletions
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29
Tests/LibWeb/Layout/expected/flex/flex-shorthand-flex-basis-zero-percent.txt Normal file
View file

@ -0,0 +1,29 @@
Viewport <#document> at (0,0) content-size 800x600 children: not-inline
BlockContainer <html> at (1,1) content-size 798x126 [BFC] children: not-inline
BlockContainer <body> at (10,10) content-size 780x108 children: not-inline
Box <div.flex> at (11,11) content-size 500x52 flex-container(row) [FFC] children: not-inline
BlockContainer <(anonymous)> at (11,11) content-size 36.84375x52 flex-item [BFC] children: inline
line 0 width: 36.84375, height: 17.46875, bottom: 17.46875, baseline: 13.53125
frag 0 from TextNode start: 0, length: 5, rect: [11,11 36.84375x17.46875]
"hello"
TextNode <#text>
Box <div.item.one> at (48.84375,12) content-size 461.15625x50 flex-container(row) flex-item [FFC] children: not-inline
BlockContainer <(anonymous)> at (48.84375,12) content-size 55.359375x50 flex-item [BFC] children: inline
line 0 width: 55.359375, height: 17.46875, bottom: 17.46875, baseline: 13.53125
frag 0 from TextNode start: 0, length: 7, rect: [48.84375,12 55.359375x17.46875]
"friends"
TextNode <#text>
BlockContainer <(anonymous)> at (10,64) content-size 780x0 children: inline
TextNode <#text>
Box <div.flex> at (11,65) content-size 500x52 flex-container(row) [FFC] children: not-inline
BlockContainer <(anonymous)> at (11,65) content-size 36.84375x52 flex-item [BFC] children: inline
line 0 width: 36.84375, height: 17.46875, bottom: 17.46875, baseline: 13.53125
frag 0 from TextNode start: 0, length: 5, rect: [11,65 36.84375x17.46875]
"hello"
TextNode <#text>
Box <div.item.two> at (48.84375,66) content-size 461.15625x50 flex-container(row) flex-item [FFC] children: not-inline
BlockContainer <(anonymous)> at (48.84375,66) content-size 55.359375x50 flex-item [BFC] children: inline
line 0 width: 55.359375, height: 17.46875, bottom: 17.46875, baseline: 13.53125
frag 0 from TextNode start: 0, length: 7, rect: [48.84375,66 55.359375x17.46875]
"friends"
TextNode <#text>

24
Tests/LibWeb/Layout/input/flex/flex-shorthand-flex-basis-zero-percent.html Normal file
View file

@ -0,0 +1,24 @@
<!doctype html><style>
* { border: 1px solid black; }
html { background: white; }
.flex {
display: flex;
flex-wrap: wrap;
background: pink;
width: 500px;
}
.item {
display: flex;
background: orange;
width: 100%;
height: 50px;
}
.one {
flex: 1;
}
.two {
flex: 1 1;
}
</style>
<div class="flex">hello<div class="item one">friends</div></div>
<div class="flex">hello<div class="item two">friends</div></div>

10
Userland/Libraries/LibWeb/CSS/Parser/Parser.cpp
View file

@ -5669,8 +5669,7 @@ ErrorOr<RefPtr<StyleValue>> Parser::parse_flex_value(Vector<ComponentValue> cons
case PropertyID::FlexGrow: {
// NOTE: The spec says that flex-basis should be 0 here, but other engines currently use 0%.
// https://github.com/w3c/csswg-drafts/issues/5742
// (flex-basis takes `<length>`, not `<number>`, so the 0 is a Length.)
auto flex_basis = TRY(LengthStyleValue::create(Length::make_px(0)));
auto flex_basis = TRY(PercentageStyleValue::create(Percentage(0)));
auto one = TRY(NumberStyleValue::create(1));
return FlexStyleValue::create(*value, one, flex_basis);
}
@ -5732,8 +5731,11 @@ ErrorOr<RefPtr<StyleValue>> Parser::parse_flex_value(Vector<ComponentValue> cons
flex_grow = TRY(property_initial_value(m_context.realm(), PropertyID::FlexGrow));
if (!flex_shrink)
flex_shrink = TRY(property_initial_value(m_context.realm(), PropertyID::FlexShrink));
if (!flex_basis)
flex_basis = TRY(property_initial_value(m_context.realm(), PropertyID::FlexBasis));
if (!flex_basis) {
// NOTE: The spec says that flex-basis should be 0 here, but other engines currently use 0%.
// https://github.com/w3c/csswg-drafts/issues/5742
flex_basis = TRY(PercentageStyleValue::create(Percentage(0)));
}
return FlexStyleValue::create(flex_grow.release_nonnull(), flex_shrink.release_nonnull(), flex_basis.release_nonnull());
}