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you know, there are some websites that just flat-out lie about the type of files they're serving

like the file has a .png extension but it's actually a gif or webp

WHY :blobcattableflip:
Seirdy
Seirdy  
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or when they serve an HTML file and use an XML suffix, or vice versa.
Casey Rollins :verified:
Casey Rollins :verified:  
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Okay that’s not too bad, all #XML files are valid #HTML, at least in syntax, right?
#HTML #xml
mewmew
mewmew  
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that's not true either way.

for example <strong><em></strong></em> is valid HTML but not XML

XML allows arbitrary tags, HTML doesn't.
mewmew
mewmew  
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XHTML is always valid HTML though/.
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