In IE6/7, getAttribute is used to obtain the href/src attribute (the relative path 0 value is different from that of other browsers.

The test code is as follows:
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There are elements a and img (standard document mode), and the relative path is set. The Effects of Various browsers are as follows:

IE6/7: return the complete path

IE8/9/10/Firefox/Safari/Chrome/Opera: return relative path

If you want to be consistent with other browsers in IE6/7, you can set the second parameter of getAttribute to 2.
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The standard getAttribute method does not define the second parameter, which is amazing. The following describes the setAttribute parameter in MSDN:

Related:

Http://msdn.microsoft.com/en-us/library/ms536429%28v=VS.85%29.aspx