highlights bad HTML, incomplete tag attributes, and inline javascript

debug.css

/*
This is a combination of:
http://meyerweb.com/eric/thoughts/2007/09/07/diagnostic-styling/
http://www.nealgrosskopf.com/tech/thread.asp?pid=17

.. with some additional tweaking and additions
*/

/* Empty Attributes */
img[alt=""],
area[alt=""],
a[href=""],
a[title=""],
input[title=""],
input[type=""],
label[for=""] {
  border:5px dotted green!important;
}

/* Empty Elements */
p:empty,
a:empty,
span:empty,
ul:empty,
ol:empty,
li:empty,
dl:empty,
dt:empty,
dd:empty,
table:empty,
td:empty,
th:empty,
thead:empty,
tbody:empty {
  border:5px solid green!important;
}

/* Inline Javascript */
a[href="javascript:void(0)"],
a[onclick],
*[onfocus],
*[onblur],
*[onhover],
*[onmouseover],
*[onmouseout] {
  border:5px dotted cyan!important;
}

/* Proposed Deprecated Attributes */
body[background],
table[background],
td[background],
th[background],
input[border],
table[border],
table[cellpadding],
table[cellspacing],
object[codebase],
img[height],
object[height],
table[height],
a[name],
form[name],
img[name],
object[name],
a[target],
area[target],
td[valign],
th[valign],
img[width],
object[width],
table[width] {
  border:5px dotted orange!important;
}

/* Deprecated Attributes */
applet[align],
caption[align],
div[align],
h1[align],
h2[align],
h3[align],
h4[align],
h5[align],
h6[align],
hr[align],
iframe[align],
img[align],
input[align],
legend[align],
object[align],
p[align],
table[align],
body[alink],
applet[alt],
applet[archive],
body[background],
body[bgcolor],
td[bgcolor],
tr[bgcolor],
table[bgcolor],
img[border],
object[border],
br[clear],
applet[code],
applet[codebase],
basefont[color],
font[color],
dir[compact],
dl[compact],
menu[compact],
ol[compact],
ul[compact],
basefont[face],
font[face],
applet[height],
td[height],
th[height],
applet[hspace],
img[hspace],
object[hspace],
script[language],
body[link],
applet[name],
hr[noshade],
td[nowrap],
th[nowrap],
applet[object],
isindex[prompt],
hr[size],
font[size],
basefont[size],
ol[start],
body[text],
li[type],
ol[type],
ul[type],
html[version],
body[vlink],
li[value],
applet[vspace],
img[vspace],
object[vspace],
hr[width],
td[width],
th[width],
applet[width],
pre[width] {
  border:5px dotted red!important;
}

/* Non-W3C Proprietary HTML Attributes */
body[bgproperties],
*[bordercolor],
*[bordercolordark],
*[bordercolorlight],
body[topmargin],
body[rightmargin],
body[bottommargin],
body[leftmargin],
table[frame] {
  border:5px dotted magenta!important;
}

/* Works with Firebug */
div:empty {
  background-color:#3875d7!important;
  padding:1px 1px 0 0;
}

/* Proposed Deprecated Elements */
input[type="button"],
input[type="reset"],
input[type="submit"],
input[type="image"],
tt,
big,
small {
  border:5px solid orange!important;
}

/* Deprecated Elements */
applet,
basefont,
center,
dir,
font,
isindex,
menu,
s,
i,
b,
hr,
strike,
u,
listing,
plaintext,
xmp {
  border:5px solid red!important;
}

/* Non-W3C Proprietary HTML Elements */
audioscope,
bgsound,
blink,
bq,
comment,
embed,
fn,
ilayer,
keygen,
layer,
limittext,
marquee,
multicol,
nobr,
noembed,
nolayer,
nosmartquotes,
rt,
ruby,
server,
sidebar,
spacer,
wbr,
xml,
blackface,
shadow {
  border:5px solid magenta!important
}

/* XHTML 1.0 Strict Prohibitions */
a > a,
pre > img,
pre > object,
pre > big,
pre > small,
pre > sub,
pre > sup,
button > input,
button > select,
button > textarea,
button > label,
button > button,
button > form,
button > fieldset,
button > iframe,
button > isindex,
label > label,
form > form { 
  border:5px solid lime!important 
}
 
/* XHTML 1.0 Strict Deprecated Attributes */
a[name],
applet[name],
form[name],
frame[name],
iframe[name],
img[name],
map[name] { 
  border:5px dotted lime!important
}