Is their a cross-origin attribute in HTML5?

Yes, the official specification states cross-origin attribute as:

The crossorigin attribute is a CORS settings attribute. Its purpose is to allow images from third-party sites that allow cross-origin access to be used with canvas.

You can use it to solve JavaScript errors like to log js errors:

if (securityOrigin()->canRequest(targetUrl)) {    msg = myErroe;    line = myLineNumber;    source = sourceURL; } else {    msg = "Error!";    source = String();    line = 0; }