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Carlos Alcaraz GregorandCarlos Alcaraz
513819ee84
width/height attributes went through parseInt with no validation, so a typo like width="abc" reached scaleIframeToFit as NaN (invalid scale(NaN) transform) and width="0" as a division by zero — both blank the player with no signal. The stage-size message check had the sibling gap: `> 0` alone lets Infinity through, which scales the iframe to 0. Reuse the composition probe's readPositiveDimension guard for the attribute path (the probe path already rejected these) and add the same finite-check the adjacent timeline branch uses for stage-size. Mirrors the clampPlaybackRate hardening from #1120. Co-authored-by: Carlos Alcaraz <193642530+calcarazgre646@users.noreply.github.com>