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LibWeb: Treat % max-width as none when containing block size indefinite

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This is technically "undefined behavior" per CSS 2.2, but it seems
sensible to mirror the behavior of max-height in the same situation.
It also appears to match how other engines behave.

Fixes #19242
This commit is contained in:
Andreas Kling 2023-06-14 18:35:02 +02:00
parent ff1606ffaf
commit 3a11b55286
7 changed files with 34 additions and 11 deletions
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4
Userland/Libraries/LibWeb/Layout/BlockFormattingContext.cpp
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@ -253,7 +253,7 @@ void BlockFormattingContext::compute_width(Box const& box, AvailableSpace const&
// 2. The tentative used width is greater than 'max-width', the rules above are applied again,
// but this time using the computed value of 'max-width' as the computed value for 'width'.
if (!computed_values.max_width().is_none()) {
if (!should_treat_max_width_as_none(box)) {
auto max_width = calculate_inner_width(box, remaining_available_space.width, computed_values.max_width());
auto used_width_px = used_width.is_auto() ? remaining_available_space.width.to_px() : used_width.to_px(box);
if (used_width_px > max_width.to_px(box)) {
@ -331,7 +331,7 @@ void BlockFormattingContext::compute_width_for_floating_box(Box const& box, Avai
// 2. The tentative used width is greater than 'max-width', the rules above are applied again,
// but this time using the computed value of 'max-width' as the computed value for 'width'.
if (!computed_values.max_width().is_none()) {
if (!should_treat_max_width_as_none(box)) {
auto max_width = calculate_inner_width(box, available_space.width, computed_values.max_width());
if (width.to_px(box) > max_width.to_px(box))
width = compute_width(max_width);