I examined today the Google Doodle of Moog Synth , dedicated to Robert Mug,

when I came across the following html code snippet:
<w id=moogk0></w>
<s id=moogk1></s>
<w id=moogk2></w>
<s id=moogk3></s>
(You can view the source code and do Ctrl + F, you will get it in the first search result).
I searched for the s and w tags, but did not find anything useful, except that the tag is ssometimes used to delete text, but now it's deprecated.
Obviously, Google will not use obsolete tags, but I think there is a lot more to it than plain HTML. Can anyone explain me the use of these tags? and how does the browser recognize them? and if the browser does not recognize them, what to use them?
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