When I use <strike>, the epubcheck plugin gives an error, just like you did.
However, when I use the <s>, the epubcheck plugin gives exactly the same error.
Then, when I try <del>, everything is fine for the epubcheck plugin.
Reading the mozilla reference you gave, I read this under the heading "warning":
If semantically appropriate, i.e., if it represents deleted content, use <del> instead. In all other cases use <s>.
Huh? I am very confused about this statement. According to the epubcheck <del> is correct, not <strike>, not <s>.
I would appreciate it, if someone could clarify this in some way that I can understand.
Thanks,
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