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Miguel Ángel
6f0b57d608
Sub-composition <head> styles targeting html/body/:root (width/height/ overflow/background) were injected into the parent document unscoped by both the Studio runtime mount (compositionLoader) and the render-time inliner (inlineSubCompositions/htmlBundler). scopeCssToComposition deliberately passed html/body/:root through unchanged, so a sub-composition smaller than the root clobbered the host <body> dimensions and its overflow:hidden clipped the composite to the last sub-comp's size. Only the top-left element painted; everything else (and framework-owned video positioned outside that box) was clipped away. Add a scopeRootSelectors option to scopeCssToComposition that remaps html/body/:root to the composition's own box, and enable it everywhere sub-composition styles are scoped. The universal selector stays untouched. Top-level composition scoping is unchanged (it legitimately owns the document). Covered by new compositionScoping tests.