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LibWeb: Don't crash in offset_parent() if no ancestor element found

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The specification says the final step of this algorithm is to return
null. Previously, the browser would crash if the content of an iframe
was appended to the document before its offsetParent property was
queried.
This commit is contained in:
Tim Ledbetter 2024-02-29 21:53:58 +00:00 committed by Tim Flynn
parent 3da6916383
commit 5b4533cab8
Notes: sideshowbarker 2024-07-17 07:48:42 +09:00 
Author: https://github.com/tcl3
Commit: https://github.com/SerenityOS/serenity/commit/5b4533cab8
Pull-request: https://github.com/SerenityOS/serenity/pull/23407
3 changed files with 25 additions and 1 deletions
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1
Tests/LibWeb/Text/expected/Element-offsetParent-of-iframe.txt Normal file
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@ -0,0 +1 @@
iframe offsetParent value: null

22
Tests/LibWeb/Text/input/Element-offsetParent-of-iframe.html Normal file
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@ -0,0 +1,22 @@
<!DOCTYPE html>
<script src="include.js"></script>
<script>
function offsetParentOfChildDocument() {
const frameDocument = document.querySelector("iframe").contentDocument;
const frameRoot = frameDocument.documentElement;
document.documentElement.append(frameRoot);
document.dispatchEvent(new CustomEvent("offsetParentCalled", { detail: { iframeOffsetParent: frameRoot.offsetParent }}));
}
asyncTest(done => {
document.addEventListener("offsetParentCalled", event => {
println(`iframe offsetParent value: ${event.detail.iframeOffsetParent}`);
done();
});
});
</script>
<iframe srcdoc="
<script>
window.parent.offsetParentOfChildDocument();
</script>
">

3
Userland/Libraries/LibWeb/HTML/HTMLElement.cpp
View File

@ -205,7 +205,8 @@ JS::GCPtr<DOM::Element> HTMLElement::offset_parent() const
return const_cast<Element*>(ancestor);
}
VERIFY_NOT_REACHED();
// 3. Return null.
return nullptr;
}
// https://www.w3.org/TR/cssom-view-1/#dom-htmlelement-offsettop