Firefox 4 now supports new HTML5 tags. This is reflected by the macros list contained within the
nsHTMLTagList.h header file in the parser/htmlparser/public folder of the
source code. Here is the complete list of available macros:
HTML_TAG(a, Anchor) HTML_HTMLELEMENT_TAG(abbr) HTML_HTMLELEMENT_TAG(acronym) HTML_HTMLELEMENT_TAG(address) HTML_TAG(applet, SharedObject) HTML_TAG(area, Area) HTML_HTMLELEMENT_TAG(article) HTML_HTMLELEMENT_TAG(aside) #if defined(MOZ_MEDIA) HTML_TAG(audio, Audio) #endif HTML_HTMLELEMENT_TAG(b) HTML_TAG(base, Shared) HTML_TAG(basefont, Span) HTML_HTMLELEMENT_TAG(bdo) HTML_TAG(bgsound, Span) HTML_HTMLELEMENT_TAG(big) HTML_HTMLELEMENT_TAG(blink) HTML_TAG(blockquote, Shared) HTML_TAG(body, Body) HTML_TAG(br, BR) HTML_TAG(button, Button) HTML_TAG(canvas, Canvas) HTML_TAG(caption, TableCaption) HTML_HTMLELEMENT_TAG(center) HTML_HTMLELEMENT_TAG(cite) HTML_HTMLELEMENT_TAG(code) HTML_TAG(col, TableCol) HTML_TAG(colgroup, TableCol) HTML_HTMLELEMENT_TAG(dd) HTML_TAG(del, Mod) HTML_HTMLELEMENT_TAG(dfn) HTML_TAG(dir, Shared) HTML_TAG(div, Div) HTML_TAG(dl, SharedList) HTML_HTMLELEMENT_TAG(dt) HTML_HTMLELEMENT_TAG(em) HTML_TAG(embed, SharedObject) HTML_TAG(fieldset, FieldSet) HTML_HTMLELEMENT_TAG(figcaption) HTML_HTMLELEMENT_TAG(figure) HTML_TAG(font, Font) HTML_HTMLELEMENT_TAG(footer) HTML_TAG(form, Form) HTML_TAG(frame, Frame) HTML_TAG(frameset, FrameSet) HTML_TAG(h1, Heading) HTML_TAG(h2, Heading) HTML_TAG(h3, Heading) HTML_TAG(h4, Heading) HTML_TAG(h5, Heading) HTML_TAG(h6, Heading) HTML_TAG(head, Shared) HTML_HTMLELEMENT_TAG(header) HTML_HTMLELEMENT_TAG(hgroup) HTML_TAG(hr, HR) HTML_TAG(html, Shared) HTML_HTMLELEMENT_TAG(i) HTML_TAG(iframe, IFrame) HTML_TAG(image, Span) HTML_TAG(img, Image) HTML_TAG(input, Input) HTML_TAG(ins, Mod) HTML_TAG(isindex, Shared) HTML_HTMLELEMENT_TAG(kbd) HTML_TAG(keygen, Span) HTML_TAG(label, Label) HTML_TAG(legend, Legend) HTML_TAG(li, LI) HTML_TAG(link, Link) HTML_HTMLELEMENT_TAG(listing) HTML_TAG(map, Map) HTML_HTMLELEMENT_TAG(mark) HTML_TAG(marquee, Div) HTML_TAG(menu, Shared) HTML_TAG(meta, Meta) HTML_TAG(multicol, Span) HTML_HTMLELEMENT_TAG(nav) HTML_HTMLELEMENT_TAG(nobr) HTML_HTMLELEMENT_TAG(noembed) HTML_HTMLELEMENT_TAG(noframes) HTML_HTMLELEMENT_TAG(noscript) HTML_TAG(object, Object) HTML_TAG(ol, SharedList) HTML_TAG(optgroup, OptGroup) HTML_TAG(option, Option) HTML_TAG(output, Output) HTML_TAG(p, Paragraph) HTML_TAG(param, Shared) HTML_HTMLELEMENT_TAG(plaintext) HTML_TAG(pre, Pre) HTML_TAG(q, Shared) HTML_HTMLELEMENT_TAG(s) HTML_HTMLELEMENT_TAG(samp) HTML_TAG(script, Script) HTML_HTMLELEMENT_TAG(section) HTML_TAG(select, Select) HTML_HTMLELEMENT_TAG(small) #if defined(MOZ_MEDIA) HTML_TAG(source, Source) #endif HTML_TAG(spacer, Shared) HTML_TAG(span, Span) HTML_HTMLELEMENT_TAG(strike) HTML_HTMLELEMENT_TAG(strong) HTML_TAG(style, Style) HTML_HTMLELEMENT_TAG(sub) HTML_HTMLELEMENT_TAG(sup) HTML_TAG(table, Table) HTML_TAG(tbody, TableSection) HTML_TAG(td, TableCell) HTML_TAG(textarea, TextArea) HTML_TAG(tfoot, TableSection) HTML_TAG(th, TableCell) HTML_TAG(thead, TableSection) HTML_TAG(title, Title) HTML_TAG(tr, TableRow) HTML_HTMLELEMENT_TAG(tt) HTML_HTMLELEMENT_TAG(u) HTML_TAG(ul, SharedList) HTML_HTMLELEMENT_TAG(var) #if defined(MOZ_MEDIA) HTML_TAG(video, Video) #endif HTML_HTMLELEMENT_TAG(wbr) HTML_HTMLELEMENT_TAG(xmp) /* These are not for tags. But they will be included in the nsHTMLTag enum anyway */ HTML_OTHER(text) HTML_OTHER(whitespace) HTML_OTHER(newline) HTML_OTHER(comment) HTML_OTHER(entity) HTML_OTHER(doctypeDecl) HTML_OTHER(markupDecl) HTML_OTHER(instruction)
Since Firefox 4 now supports these new HTML5 elements, there have been some slight changes in the
html.css default style sheet. In short, the aside and article elements now have
all the declaration display: block and apparently work exactly as normal div elements.