Seed pages:

https://developer.mozilla.org/en-US/docs/Web/API
https://developer.mozilla.org/en-US/docs/DOM/DOM_Reference
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference
https://developer.mozilla.org/en-US/docs/Web/HTML/Element
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference

Don't need as seeds if depth is set to at least 3:

https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Mozilla_Extensions

Pages that seemed promising but have dead links or are redundant or lead to pages that seem like
they should have compatibilty tables but don't:

https://developer.mozilla.org/en-US/docs/Web/Reference/Events
https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes
https://developer.mozilla.org/en-US/docs/Web/HTML/Attributes
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Webkit_Extensions
https://developer.mozilla.org/en-US/docs/Web/CSS/CSS3

Overview pages that are too far from the target pages:

https://developer.mozilla.org/en-US/docs/Web
https://developer.mozilla.org/en-US/docs/Web/Reference/API
https://developer.mozilla.org/en-US/docs/DOM
https://developer.mozilla.org/en-US/docs/Web/JavaScript
https://developer.mozilla.org/en-US/docs/Web/HTML
https://developer.mozilla.org/en-US/docs/Web/HTML/Reference
https://developer.mozilla.org/en-US/docs/Web/CSS

Overview pages that still need to have seed pages extracted:

https://developer.mozilla.org/en-US/docs/WebAPI
https://developer.mozilla.org/en-US/docs/Web/MathML
https://developer.mozilla.org/en-US/docs/Web/Reference/API (check if have other seeds for WebGL,
Web Audio, any of the APIs that actually have compat info)
https://developer.mozilla.org/en-US/docs/Web/SVG
https://developer.mozilla.org/en-US/docs/Web/WebGL

Need better seed pages for:

https://developer.mozilla.org/en-US/docs/Web_Audio_API
https://developer.mozilla.org/en-US/docs/Web/WebGL

Gotchas:

This page has a heading Browser Compatibility followed by a text description.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/const

This is really an overview page but has a table of sorts, followed by text info.
https://developer.mozilla.org/en-US/docs/Web/WebGL

Not yet covered:

XML, Xpath, XSLT, XUL