getElementsByAttribute() is not a function

Is it not a chrome standard function?

No, it isn't.

From MDN:

Note that this method is only available on XUL elements; it is not part of the W3C DOM.

Consider using querySelectorAll with an attribute selector instead.

From documentation:

Note that this method is only available on XUL elements; it is not part of the W3C DOM.

Use this:

document.querySelectorAll("[xlink|href='"+id+"']");