Reset for HTML4 / HTML5

html_reset.css

/* `XHTML, HTML4, HTML5 Reset
----------------------------------------------------------------------------------------------------*/

a,
abbr,
acronym,
address,
applet,
article,
aside,
audio,
b,
big,
blockquote,
body,
canvas,
caption,
center,
cite,
code,
dd,
del,
details,
dfn,
dialog,
div,
dl,
dt,
em,
embed,
fieldset,
figcaption,
figure,
font,
footer,
form,
h1,
h2,
h3,
h4,
h5,
h6,
header,
hgroup,
hr,
html,
i,
iframe,
img,
ins,
kbd,
label,
legend,
li,
mark,
menu,
meter,
nav,
object,
ol,
output,
p,
pre,
progress,
q,
rp,
rt,
ruby,
s,
samp,
section,
small,
span,
strike,
strong,
sub,
summary,
sup,
table,
tbody,
td,
tfoot,
th,
thead,
time,
tr,
tt,
u,
ul,
var,
video,
xmp {
  border: 0;
  margin: 0;
  padding: 0;
  font-size: 100%;
}

html,
body {
  height: 100%;
}

article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
menu,
nav,
section {
/*
  Override the default (display: inline) for
  browsers that do not recognize HTML5 tags.

  IE8 (and lower) requires a shiv:
  http://ejohn.org/blog/html5-shiv
*/
  display: block;
}

b,
strong {
/*
  Makes browsers agree.
  IE + Opera = font-weight: bold.
  Gecko + WebKit = font-weight: bolder.
*/
  font-weight: bold;
}

img {
  font-size: 0;
  vertical-align: middle;
/*
  For IE.
  http://css-tricks.com/ie-fix-bicubic-scaling-for-images
*/
  -ms-interpolation-mode: bicubic;
}

li {
/*
  For IE6 + IE7.
*/
  display: list-item;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
}

th,
td,
caption {
  font-weight: normal;
  vertical-align: top;
  text-align: left;
}

svg {
/*
  For IE9.
*/
  overflow: hidden;
}

MIT = Use for whatever you want, commercial or otherwise -- just give credit.

GPL = Anything you release as a derivative work must also be free, and GPL.

Under a dual license, someone can use the work as "MIT" and not have to abide by GPL's re-release stipulations. GPL is nice because it forces open source to stay as such, but it's a "poison pill" if derivative works are included in a larger commercial product, as technically it GPL's the whole thing.

At least, that's my non-lawyerly take on it how things work.