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LibWeb: Don't crash when determining slot element auto directionality

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Tim Ledbetter 2024-09-10 18:26:56 +01:00 • committed by Tim Flynn
commit 0de3145071
Notes: github-actions[bot] 2024-09-10 19:59:53 +00:00
3 changed files with 16 additions and 1 deletions
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1
Tests/LibWeb/Text/expected/HTML/dir-slot-auto-directionality.txt Normal file
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@ -0,0 +1 @@
Slot directionality: ltr

14
Tests/LibWeb/Text/input/HTML/dir-slot-auto-directionality.html Normal file
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@ -0,0 +1,14 @@
<!DOCTYPE html>
<script src="../include.js"></script>
<div id="root">
<span></span>
</div>
<script>
const root = document.getElementById("root");
test(() => {
const shadowTree = `<slot dir="auto"></slot>`;
const shadow = document.querySelector("#root").attachShadow({mode: "open"});
shadow.innerHTML = shadowTree;
println(`Slot directionality: ${getComputedStyle(shadow.querySelector("slot")).direction}`);
});
</script>

2
Userland/Libraries/LibWeb/DOM/Element.cpp
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@ -2643,7 +2643,7 @@ Optional<Element::Directionality> Element::auto_directionality() const
VERIFY(child->is_element()); VERIFY(child->is_element());
// 2. Set childDirection to the auto directionality of child. // 2. Set childDirection to the auto directionality of child.
child_direction = static_cast<HTML::HTMLElement const&>(*this).auto_directionality(); child_direction = static_cast<HTML::HTMLElement const&>(*child).auto_directionality();
} }
// 4. If childDirection is not null, then return childDirection. // 4. If childDirection is not null, then return childDirection.