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53fa1b19f1
Replace the spin_until in SVGScriptElement::process_the_script_element with an async fetch that mirrors HTMLScriptElement's mark_as_ready pattern. External SVG scripts now fetch and execute asynchronously, matching Chromium's behavior. For HTML-embedded SVG scripts, the parser pauses via the existing schedule_resume_check infrastructure, extended to support SVG scripts through a new pending_parsing_blocking_svg_script slot on Document. For top-level XML/SVG documents, scripts execute when their fetch completes; the load event is delayed via DocumentLoadEventDelayer which the existing XMLDocumentBuilder::document_end already waits on.