1. CSS namespaces

    Using the `@namespace` at-rule, elements of other namespaces (e.g. SVG) can be targeted using the pipe (`|`) selector.

  2. element api: getelementsbytagnamens: `getelementsbytagnamens(namespaceuri, "*")`

  3. element api: getelementsbytagname: `getelementsbytagname("*")`

  4. htmlselectelement api: name

  5. htmlselectelement api: nameditem

  6. css selector: class selector (`.classname`)

  7. css selector: id selector (`#idname`)

  8. css selector: namespace selector (`|`)

  9. css selector: type selector (`elementname`)

  10. css selector: type selector (`elementname`): namespaces (`ns|elementname`)

  11. css selector: universal selector (`*`): namespaces (`*|*`)

  12. html element: select: name

  13. css @apply rule