Implement circa 2021 spec change for fragment parsing in foreign content #115
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This change brings us into conformance with the “make breaking out of foreign content apply in innerHTML” requirements from the HTML spec PR at whatwg/html#6399 — and into interoperability with current WebKit and Blink behaviour, making fragment parsing break out of foreign content in the same way document parsing does. Before this code change, when parsing elements like <p>, <div>, and <nobr> inside SVG/MathML via innerHTML, they would stay in the foreign namespace. But, with this change, they now correctly “break out”, and are created in the HTML namespace. TreeBuilder.java ---------------- - Start tags: Remove fragment-only restriction on break-out behavior - End tags: Allow </p> and </br> to reach mode-handling-in-fragment case - Use currentPtr > 0 to preserve context element when popping
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hsivonen
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Dec 30, 2025
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This change brings us into conformance with the “make breaking out of foreign content apply in innerHTML” requirements from the HTML spec PR at whatwg/html#6399 — and into interoperability with current WebKit and Blink behaviour, making fragment parsing break out of foreign content in the same way document parsing does.
Before this code change, when parsing elements like
p,div, andnobrinside SVG/MathML via innerHTML, they would stay in the foreign namespace. But, with this change, they now correctly “break out”, and are created in the HTML namespace.TreeBuilder.java</p>and `q to reach mode-handling-in-fragment case
currentPtr > 0to preserve context element when popping