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by dandelany 4109 days ago
They have no choice. If they used an AJAX call it could be blocked by (lack of) ACAO headers. The only way to hit a remote URL that cannot be blocked is by adding a <script href="//github..." /> tag to the URL, which means the client has no choice but to run the contents.
1 comments

What about an img tag?
Hmm, yes that would probably work... Not sure though.