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Does HTML5 support backward compatibility in mobile?
If the browser is not support HTML5 while run a html5 page in mobile browser, whether it will throw error when audio/video is not support or we able to customize the error/alternate code. Also design wise it supports rest of tags?
Thanks in advance,
Sri
As far as I am aware, unknown tags will be ignored.
I suggest you use a script such as modernizr to detect the support of the functionality you are looking to use. You can then code progressively, as you intended.