It’s interesting to see the casual slide of Google towards almost internet explorer 5.1 style behavior, where standards can just be ignored “because market share”.
Having flashbacks of “<!--[if IE 6]> <script src="fix-ie6.js"></script> <![endif]-->”
I don’t get the comparison. The XSLT deprecation has support beyond Google.
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So-called "standards" on the Google (c) Internet (c) network are but a formality.
The standards body is deprecating XSLT with support from Mozilla and Safari (Mozilla first proposed the removal).
Not sure how you got from that to “Google is ignoring standards”.