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LibWeb: Don't resolve CSS property values for unconnected elements

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While it's possible to getComputedStyle() on an unconnected element,
the resulting object is not supposed to have any values, since we can't
resolve style without a document root anyway.

This fixes a crash on https://bandcamp.com
This commit is contained in:
Andreas Kling
2023-05-10 15:33:10 +02:00
parent 4005793e79
commit 89ba7246dd
3 changed files with 23 additions and 0 deletions
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5
Userland/Libraries/LibWeb/CSS/ResolvedCSSStyleDeclaration.cpp
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@@ -666,6 +666,11 @@ ErrorOr<RefPtr<StyleValue const>> ResolvedCSSStyleDeclaration::style_value_for_p
Optional<StyleProperty> ResolvedCSSStyleDeclaration::property(PropertyID property_id) const
{
// https://www.w3.org/TR/cssom-1/#dom-window-getcomputedstyle
// NOTE: This is a partial enforcement of step 5 ("If elt is connected, ...")
if (!m_element->is_connected())
return {};
if (CSS::property_affects_layout(property_id)) {
const_cast<DOM::Document&>(m_element->document()).update_layout();
} else {