expand (no-op) support of DOM shim for DOM traversal methods

[thescientist13]

Type of Change

• New Feature Request

Summary

Tracking a number of items that I think the DOM shim should be able to support, though I'm not sure how feasible / realistic any of them are, so will need to do some discovery of what makes sense to fall "in bounds" for SSR, short of just becoming a headless browser.

Details

Not sure how many of these can / should be supported, but some of them at least, if not at least for no-ops

• [ ] parentNodes
• [ ] querySelector / querySelectorAll
• [ ] getElementBy[Id|ClassName|TagName|...]
• [ ] Node <> Element <> HTMLElement (ensure proper inheritance hierarchy)

Questions

• Is appendNode implemented correctly?
• Use ASTs in DOM shim (?)