This change affects nodes with an XML namespace prefix, such as
<svg:circle>. In this case,
getElementsByTagName('svg:circle') no longer matches the node and
getElementsByTagName('circle') can be used instead. However, the
getElementsByTagNameNS method is more formal and recommended, therefore it could be replaced with
Apparently the configuration page of some HP printers is broken due to this change.
Update: This change has been reverted to avoid breaking the HP printer configuration page. The DOM spec will be changed to match
tagName as before.