DOM + lifecycle layer for x-code — a code-display component.
The component is stateless: DOM = f(attributes, properties). Source code is
read from the code attribute or else the element's light-DOM textContent,
tokenized by the pure model layer, and rendered escaped into
the shadow <code>. A MutationObserver re-renders when the light-DOM text
changes. The expand/collapse state lives in the observed expanded
attribute, so it too is a value, never a mutable field.
Instance fields hold only the refs map, the cached model and the MutationObserver.
DOM + lifecycle layer for x-code — a code-display component. The component is stateless: DOM = f(attributes, properties). Source code is read from the `code` attribute or else the element's light-DOM textContent, tokenized by the pure model layer, and rendered escaped into the shadow `<code>`. A MutationObserver re-renders when the light-DOM text changes. The expand/collapse state lives in the observed `expanded` attribute, so it too is a value, never a mutable field. Instance fields hold only the refs map, the cached model and the MutationObserver.
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