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Two independent post-release feedback reports of the same mechanism: a leading <svg> block (icon/gradient/filter <defs>, referenced by url(#id) elsewhere in the document) placed before the real [data-composition-id] root manufactures root_missing_composition_id + root_missing_dimensions on an otherwise-correct composition. Moving the <svg> after the root cleared both findings for each reporter. findRootTag returned the first body child that wasn't script/style/meta/ link/title, unconditionally — <svg> was never in that skip list, so a leading defs-only <svg> got treated as the root. Fix: skip a leading <svg> when it carries none of the composition markers itself (data-composition-id/data-width/data-height), so an intentionally SVG-rooted composition is still eligible as the root. The first attempt at this only skipped the <svg> open tag, which surfaced a second bug: extractOpenTags is a flat, nesting-unaware scan, so the very next tag it returns after skipping <svg> is the svg's own nested child (<defs>, <filter>, ...), not the sibling after </svg>. Track the svg's closing tag position and skip every tag before it, not just the <svg> tag itself. Tests: skips a leading svg defs block (no false root findings); still treats an <svg> as the root when data-composition-id/data-width/ data-height are declared directly on it. Full lint suite (308 tests) passes.