1. DOM Parsing and Serialization

    Various DOM parsing and serializing functions, specifically `DOMParser`, `XMLSerializer`, `innerHTML`, `outerHTML` and `insertAdjacentHTML`.

  2. domparser api

  3. domparser api: `domparser()` constructor

  4. domparser api: parsefromstring

  5. domparser api: parsefromstring: html (`text/html`) support

  6. domparser api: parsefromstring: svg (`image/svg+xml`) support

  7. domparser api: parsefromstring: xml (`application/xml`) support