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LibWeb: Don't resolve CSS property values for unconnected elements
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
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Viewport <#document> at (0,0) content-size 800x600 children: not-inline
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BlockContainer <html> at (0,0) content-size 800x37.835937 [BFC] children: not-inline
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BlockContainer <body> at (8,8) content-size 784x21.835937 children: inline
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line 0 width: 362.617187, height: 21.835937, bottom: 21.835937, baseline: 16.914062
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frag 0 from TextNode start: 0, length: 35, rect: [8,8 362.617187x21.835937]
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"This test passes if we don't crash."
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TextNode <#text>
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@ -0,0 +1,11 @@
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<!doctype html><style>
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* { font: 20px SerenitySans; }
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</style><script>
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let fragment = document.createDocumentFragment()
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let a = document.createElement("a")
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fragment.appendChild(a)
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let b = document.createElement("b")
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a.appendChild(b)
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window.getComputedStyle(b).display
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</script>
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This test passes if we don't crash.
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@ -666,6 +666,11 @@ ErrorOr<RefPtr<StyleValue const>> ResolvedCSSStyleDeclaration::style_value_for_p
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Optional<StyleProperty> ResolvedCSSStyleDeclaration::property(PropertyID property_id) const
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{
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// https://www.w3.org/TR/cssom-1/#dom-window-getcomputedstyle
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// NOTE: This is a partial enforcement of step 5 ("If elt is connected, ...")
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if (!m_element->is_connected())
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return {};
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if (CSS::property_affects_layout(property_id)) {
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const_cast<DOM::Document&>(m_element->document()).update_layout();
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} else {
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