GDCSS

Content sectioning
- Layout (article, aside, footer, header, main, nav & section)
- Headings (h1, h2, h3, h4, h5, h6 & hgroup)
Text content (address, blockquote, cite & q)
- Containers for styling (div, span, dl, dt, dd, figure, figcaption, hr, ul, ol, li p & pre)
Inline text semantics (a)
- Emphasis (b, strong, en, i)
- Code & outputs (code, kbd, mark, var, samp, data & time)
- Special word semantics (abbr & dfn)
- Smaller semantics (small, sub & sup)
- Text decoration (u, s, del, ins)
- White space & containers (br, wbr)
Language
Image & multimedia
- Image maps
- Image, audio & motion
Embedded content
Scripting
Demarcating edits
Table content
Forms
Interactive elements