Document ShadowRootInit.slotAssignment

[Peeja]

Summary

Documents the (new-ish) manual slot assignment mode (slotAssignment: 'manual').

Motivation

I was trying to get HTMLSlotElement.assign() to work, but I couldn't get anything to happen. Turns out there's an option to turn it on, it just wasn't on MDN yet. 😄

Supporting details

• DOM Spec
• Spec PR

Related issues

Fix #8782

Metadata

• Adds a new document
• Rewrites (or significantly expands) a document
• Fixes a typo, bug, or other error

TODO

• I'd like to update the HTMLSlotElement.assign() page to mention this as well. That would have been the hook I needed to see this the first time.

[Josh-Cena]

@Peeja Do you plan to complete your TODO any time soon? Documentation had been added in #20197 but it's nowhere as complete as yours, and I do want to see the assign() reference being updated as well.

[github-actions]

Preview URLs

• /en-US/docs/Web/API/Element/attachShadow

Flaws

URL: /en-US/docs/Web/API/Element/attachShadow
Title: Element.attachShadow()
Flaw count: 6

• macros:
  • /en-US/docs/Web/HTML/Element/h1 redirects to /en-US/docs/Web/HTML/Element/Heading_Elements
  • /en-US/docs/Web/HTML/Element/h2 redirects to /en-US/docs/Web/HTML/Element/Heading_Elements
  • /en-US/docs/Web/HTML/Element/h3 redirects to /en-US/docs/Web/HTML/Element/Heading_Elements
  • /en-US/docs/Web/HTML/Element/h4 redirects to /en-US/docs/Web/HTML/Element/Heading_Elements
  • /en-US/docs/Web/HTML/Element/h5 redirects to /en-US/docs/Web/HTML/Element/Heading_Elements
  • and 1 more flaws omitted

[bsmth]

I'm going to close this one for now because it's inactive. @Peeja if you would like to pick this up again, feel free to reopen! Thank you :)