I'm adding my android app link references to specific pages on my website, using the <link rel="alternate" element as follows:
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<link rel="alternate" href="android-app://com.avcalc.aqua_calc.convert.droid/https/www.aqua-calc.com/one-to-all/" />
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12. Warning in line 1 at character 938: The value for "href" is not in a valid or recognizable form such as http://, https://, ftp://, gopher://, nntp://, telnet://, wais://, javascript:, mailto:, news:, etc. Please ensure that it is correct.
I'm running CSE HTML Validator v17.0403
Thank you,
Alex.