Menu is not included in the "correct block display" rule.

[thierryk]

Shouldn't menu be added to the rule below?

article,
aside,
details,
figcaption,
figure,
footer,
header,
hgroup,
main,
nav,
section,
summary {
  display: block;
}

[salexzee]

I disagree. menu is currently experimental and only supported by Firefox. It probably shouldn't be added until it is at least partially supported by all the major browsers.

[thierryk]

I did a quick check on my Mac and found menu in these UA style sheets:

Chrome 37 and Safari 7:

ul, menu, dir {
    display: block;
    list-style-type: disc;
    -webkit-margin-before: 1em;
    -webkit-margin-after: 1em;
    -webkit-margin-start: 0px;
    -webkit-margin-end: 0px;
    -webkit-padding-start: 40px;
}

Firefox 32:

ul, menu, dir {
    -moz-padding-start: 40px;
    display: block;
    list-style-type: disc;
    margin: 1em 0;
}

In my opinion, this should justify the addition of menu in the rule that styles html5 elements as block-level elements.

[necolas]

Sounds good to me