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diagnostic.css
/* content styles */ applet:hover:after, basefont:hover:after, center:hover:after, dir:hover:after, font:hover:after, isindex:hover:after, menu:hover:after, strike:hover:after, s:hover:after, u:hover:after, *[background]:hover:after, *[bgcolor]:hover:after, *[clear]:hover:after, *[color]:hover:after, *[compact]:hover:after, *[noshade]:hover:after, *[nowrap]:hover:after, *[size]:hover:after, *[start]:hover:after, *[bottommargin]:hover:after, *[leftmargin]:hover:after, *[rightmargin]:hover:after, *[topmargin]:hover:after, *[marginheight]:hover:after, *[marginwidth]:hover:after, *[alink]:hover:after, *[link]:hover:after, *[text]:hover:after, *[vlink]:hover:after, *[align]:hover:after, *[valign]:hover:after, *[hspace]:hover:after, *[vspace]:hover:after, *[height]:hover:after, *[width]:hover:after, ul[type]:hover:after, ol[type]:hover:after, li[type]:hover:after, iframe:not([title]):hover:after, div[role="img"]:not([aria-label]):hover:after, a[href=""]:hover:after, a[href="#"]:hover:after, a:not([href]):hover:after, a[href*=javascript\:]:hover:after, a[onclick]:hover:after, a[href=""]:focus:after, a[href="#"]:focus:after, a:not([href]):focus:after, a[href*=javascript\:]:focus:after, a[onclick]:focus:after, fieldset > :not(legend):first-child:after, fieldset > legend:not(:first-child):after, label:not([for]):hover:after, *[accesskey]:hover:after, th:empty:hover:after, table > tr:only-child:after, table > tbody > tr:only-child:after, table[align]:after, table[bgcolor]:after, table[outline]:after, table[cellpadding]:after, table[cellspacing]:after, table[width]:after, td[width]:after, td[valign]:after { position: absolute; display: block; width: 200px; background: #fcfcfc; color: #333; outline: 2px solid; padding: 5px; } /* content styles */ applet:hover:after, basefont:hover:after, center:hover:after, dir:hover:after, font:hover:after, isindex:hover:after, menu:hover:after, strike:hover:after, s:hover:after, u:hover:after, *[background]:hover:after, *[bgcolor]:hover:after, *[clear]:hover:after, *[color]:hover:after, *[compact]:hover:after, *[noshade]:hover:after, *[nowrap]:hover:after, *[size]:hover:after, *[start]:hover:after, *[bottommargin]:hover:after, *[leftmargin]:hover:after, *[rightmargin]:hover:after, *[topmargin]:hover:after, *[marginheight]:hover:after, *[marginwidth]:hover:after, *[alink]:hover:after, *[link]:hover:after, *[text]:hover:after, *[vlink]:hover:after, *[align]:hover:after, *[valign]:hover:after, *[hspace]:hover:after, *[vspace]:hover:after, *[height]:hover:after, *[width]:hover:after, ul[type]:hover:after, ol[type]:hover:after, li[type]:hover:after, iframe:not([title]):hover:after { position: absolute; background: #fff; padding: 3px; outline: 2px solid; color: #333; } /* Deprecated Elements - cannot be overridden by user styles */ applet, basefont, center, dir, font, isindex, menu, s, strike, u { outline: 2px dotted red !important; } applet:hover:after { content: " <applet> is a deprecated HTML element"; } basefont:hover:after { content: " <basefont> is a deprecated HTML element"; } center:hover:after { content: " <center> is a deprecated HTML element"; } dir:hover:after { content: " <dir> is a deprecated HTML element"; } font:hover:after { content: " <font> is a deprecated HTML element"; } isindex:hover:after { content: " <isindex> is a deprecated HTML element"; } menu:hover:after { content: " <menu> is a deprecated HTML element"; } strike:hover:after { content: " <strike> is a deprecated HTML element"; } s:hover:after { content: " <s> is a deprecated HTML element"; } u:hover:after { content: " <u> is a deprecated HTML element"; } /* Deprecated Attributes - cannot be overridden by user styles */ *[background], *[bgcolor], *[clear], *[color], *[compact], *[noshade], *[nowrap], *[size], *[start], *[bottommargin], *[leftmargin], *[rightmargin], *[topmargin], *[marginheight], *[marginwidth], *[alink], *[link], *[text], *[vlink], *[align], *[valign], *[hspace], *[vspace], *[height], *[width], ul[type], ol[type], li[type] { outline: 2px solid red; } img[height], img[width] { outline: none; } *[background]:hover:after { content: " background is a deprecated HTML attribute"; } *[bgcolor]:hover:after { content: " bgcolor is a deprecated HTML attribute"; } *[clear]:hover:after { content: " clear is a deprecated HTML attribute"; } *[color]:hover:after { content: " color is a deprecated HTML attribute"; } *[compact]:hover:after { content: " compact is a deprecated HTML attribute"; } *[noshade]:hover:after { content: " noshade is a deprecated HTML attribute"; } *[nowrap]:hover:after { content: " nowrap is a deprecated HTML attribute"; } *[size]:hover:after { content: " size is a deprecated HTML attribute"; } *[start]:hover:after { content: " start is a deprecated HTML attribute"; } *[bottommargin]:hover:after { content: " bottommargin is a deprecated HTML attribute"; } *[leftmargin]:hover:after { content: " leftmargin is a deprecated HTML attribute"; } *[rightmargin]:hover:after { content: " rightmargin is a deprecated HTML attribute"; } *[topmargin]:hover:after { content: " topmargin is a deprecated HTML attribute"; } *[marginheight]:hover:after { content: " marginheight is a deprecated HTML attribute"; } *[marginwidth]:hover:after { content: " marginwidth is a deprecated HTML attribute"; } *[alink]:hover:after { content: " alink is a deprecated HTML attribute"; } *[link]:hover:after { content: " link is a deprecated HTML attribute"; } *[text]:hover:after { content: " text is a deprecated HTML attribute"; } *[vlink]:hover:after { content: " vlink is a deprecated HTML attribute"; } *[align]:hover:after { content: " align is a deprecated HTML attribute"; } *[valign]:hover:after { content: " valign is a deprecated HTML attribute"; } *[hspace]:hover:after { content: " hspace is a deprecated HTML attribute"; } *[vspace]:hover:after { content: " vspace is a deprecated HTML attribute"; } *[height]:hover:after { content: " height is a deprecated HTML attribute"; } *[width]:hover:after { content: " width is a deprecated HTML attribute"; } ul[type]:hover:after, ol[type]:hover:after, li[type]:hover:after { content: " type is a deprecated HTML attribute"; } /* Inline frames without title attribute */ iframe:not([title]) { outline: 2px solid red !important; } iframe:not([title]):hover:after { content: " <iframe> does not have a title attribute defined."; } /** * Image-related checks * Can't add generated content to images. Think... */ /* server-side image map. Yes these are sometimes still seen, if rarely */ img[ismap] { outline: 2px solid red; } /* Images without alt attribute */ img:not([alt]) { outline: 2px solid red; } /* something that has a role of image but no alternative */ div[role="img"]:not([aria-label]) { outline: 2px solid red; } /* I don't know if that will work; but worth a try. */ div[role="img"]:not([aria-label]):hover:after { content: " This content has a role of image but no aria-label attribute."; } /* images without a source */ img:not([src]), img[src=""], img[src="#"] { outline: 2px solid red !important; } /** * Link-related checks */ /* Bad links, possibly relying on javascript to do something */ a[href=""], a[href="#"], a:not([href]), a[href*=javascript\:], a[onclick] { outline: 2px solid red !important; } a[href=""]:hover:after, a[href="#"]:hover:after, a:not([href]):hover:after, a[href*=javascript\:]:hover:after, a[onclick]:hover:after, a[href=""]:focus:after, a[href="#"]:focus:after, a:not([href]):focus:after, a[href*=javascript\:]:focus:after, a[onclick]:focus:after { content: " This link may depend on JavaScript to perform it's function."; } /** * form-related checks */ /* Legends */ fieldset > :not(legend):first-child, /* no other element than a legend can be first child of a fieldset element */ fieldset > legend:not(:first-child) { /* and a legend can't be anything else than first child of a fieldset element */ outline: 2px dashed red !important; } fieldset > :not(legend):first-child:after, fieldset > legend:not(:first-child):after { content: " <legend> must be the first child of a fieldset"; } /* Input[type="image"] and their alt attribute Note: adding :before or :after on this type of element won't work. Maybe background-image encoded in base64? @reference Technique for WCAG 2.0 H36: Using alt attributes on images used as submit buttons - http://www.w3.org/TR/WCAG-TECHS/H36.html @reference Technique for WCAG 2.0 F65: Failure (...) due to omitting the alt attribute on (...) input elements of type "image" - http://www.w3.org/TR/WCAG-TECHS/F65.html */ input[type="image"][alt=""], input[type="image"]:not([alt]) { display: block; background-color: red !important; width: 200px !important; height: 3em !important; } /* Missing 'for' attribute on a label */ label:not([for]) { outline: 2px solid red !important; } label:not([for]):hover:after { content: " This label does not have a for attribute associating it with a form input."; } /* Accesskey is a bad idea. * @reference Old discussion but still hits on salient points http://www.cs.tut.fi/~jkorpela/forms/accesskey.html */ *[accesskey] { outline: 2px solid red; } *[accesskey]:hover:after { content: " Do not use the accesskey attribute."; } /** * TABLE RELATED CHECKS */ /* Empty Header Cells */ th:empty { padding: 20px; outline: 2px solid yellow !important; } th:empty:after { content: " Table header cell is empty."; } /* only one TR in the table. Is that a layout table? */ table > tr:only-child, table > tbody > tr:only-child { outline: 2px solid red; } table > tr:only-child:after, table > tbody > tr:only-child:after { content: " Table has only one row. Is this a layout table?" } /* Deprecated attributes on table */ table[align], table[bgcolor], table[outline], table[cellpadding], table[cellspacing], table[width], td[width], td[valign] { outline: 2px solid red; } table[align]:after, table[bgcolor]:after, table[outline]:after, table[cellpadding]:after, table[cellspacing]:after, table[width]:after, td[width]:after, td[valign]:after { content: " This table uses one or more deprecated attributes: align, bgcolor, outline, cellpadding, cellspacing, width, or valign"; }
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