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render: honor legacy center layout

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SGavrl committed 2026-07-23 18:05:41 +00:00
1 parent 20d31938a1
commit 8422cfccd0
3 files changed
+114 -11
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crates/obscura-render/src/style.rs
+18 -7
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@@ -44,10 +44,12 @@ pub fn ua_style(tag: &str) -> LayoutStyle {
_ => Display::Block,
};
if tag == "center" {
style.display = Display::Flex;
style.internal_flex_container = true;
style.flex_direction = Some(taffy::FlexDirection::Column);
style.align_items = Some(taffy::AlignItems::CENTER);
// Browser UA sheets keep <center> block-level and give it a special
// inherited text alignment which also centers fixed-width block
// descendants. Keep that provenance separate from ordinary authored
// text-align:center.
style.text_align = Some(taffy::AlignItems::CENTER);
style.legacy_center = true;
} else if tag == "head" || tag == "script" || tag == "style" || tag == "title" || tag == "meta" || tag == "link" || tag == "noscript" || tag == "template"
|| tag == "desc" || tag == "metadata" || tag == "option" || tag == "optgroup"
|| tag == "source" || tag == "track" || tag == "param" || tag == "area" {
@@ -416,9 +418,18 @@ fn apply_value(style: &mut LayoutStyle, name: &str, value: &str) {
// deliberately separate from flex/grid `align-items`, which positions
// child boxes rather than text inside them.
"text-align" => match value {
"right" | "end" => style.text_align = Some(taffy::AlignItems::FLEX_END),
"center" => style.text_align = Some(taffy::AlignItems::CENTER),
"left" | "start" | "justify" => style.text_align = Some(taffy::AlignItems::FLEX_START),
"right" | "end" => {
style.text_align = Some(taffy::AlignItems::FLEX_END);
style.legacy_center = false;
}
"center" => {
style.text_align = Some(taffy::AlignItems::CENTER);
style.legacy_center = false;
}
"left" | "start" | "justify" => {
style.text_align = Some(taffy::AlignItems::FLEX_START);
style.legacy_center = false;
}
_ => {}
},
"align-items" => {