don't require people to set crossorigin on assets (fixes #1775) #1789
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Description:
If cross-origin media element is defined in
<a-assets>withoutcrossoriginattribute set, then<a-assets>will re-append the media element withcrossoriginset to re-request with correct headers. three.js will then be able to access the contents of the resource.This means no more CORS confusions!