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Performance: Chrome Downloads 2 Poster Images When Crossorigin Attribute (Anonymous) Present on Video

Published by Michael Spellacy (Spell) on

Browser: Chrome 53.0.2785.116 (64-bit)
Operating System: OS X 10.11.5

This issue also present on most stable release of Chrome for Windows.


The poster image on a video element appears to be downloaded twice when a crossorgin attribute with a value of "anonymous" also exists on same element.

This attribute and value are required to get our video captioning to render from our CDN.


<video crossorigin="anonymous" preload="none" poster="" controls>

    <source src="" type="video/mp4">
    <track label="English" kind="subtitles" srclang="en" src="">


Attribute: Present

Attribute: Not Present