Fig. 1 The 10 most common HTML diagnostics and their frequency (as procentage of web sites) in the Irish and UK samples
HTML Diagnostic IE UK
Undefined attribute 86.67 92.29
Element not allowed by document type 73.33 72.36
End tag for not opened element 62.22 66.31
Required attribute not specified 60.00 75.92
Missing required end tag 51.11 48.87
Non SGML character number 46.67 34.76
Attribute value must be literal 44.44 38.20
General entity not defined and no default entity 42.22 47.33
Attribute value not allowed 33.33 37.72
End tag for element not finished 28.89 34.64

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