Pseudo-Elements in Blink's Layout Tree
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In the Blink rendering engine, CSS pseudo-elements are managed through specialized C++ classes and internal structures that link them to their originating DOM elements. These entities are dynamically generated during style resolution only when necessary, ensuring that memory is not wasted on unused markers or backdrops. Unlike standard nodes, they do not appear in the traditional DOM child list but are instead integrated directly into the layout tree to render generated content. Their lifecycle is strictly tied to the parent element, with the engine handling their automatic creation, style updates, and removal based on CSS rules. While Blink supports a wide array of standard and internal pseudo-elements, it does not currently permit developers to define their own custom types at runtime.
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