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LibWeb: Round lengths to 3 decimals after resolving from percentage

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This is a hack to emulate the behavior of other engines that use
fixed-point math. By rounding to 3 decimals, we retain a fair amount of
detail, while still allowing overshooting 100% without breaking lines.

This is both gross and slow, but it fixes real sites. Notably, the
popular Bootstrap library uses overshooting percentages in their
12-column grid system.

This hack can be removed when CSSPixels is made a fixed-point type.
This commit is contained in:
Andreas Kling 2023-06-01 16:45:35 +02:00
parent 2452cf6b55
commit 1a6a4ca7d4
5 changed files with 45 additions and 13 deletions
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2
Tests/LibWeb/Layout/expected/grid/unresolvable-percentage-track.txt
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@ -3,7 +3,7 @@ Viewport <#document> at (0,0) content-size 800x600 children: not-inline
BlockContainer <body> at (8,8) content-size 784x17.46875 children: not-inline
Box <div.ipc-page-grid> at (8,8) content-size 784x17.46875 flex-container(row) [FFC] children: not-inline
Box <div.ipc-sub-grid> at (8,8) content-size 36.84375x17.46875 flex-item [GFC] children: not-inline
BlockContainer <div> at (8,8) content-size 36.84375x17.46875 [BFC] children: inline
BlockContainer <div> at (8,8) content-size 36.844x17.46875 [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: [8,8 36.84375x17.46875]
"hello"