Update the CSS Linked Parameters Support for External SVG Images Explainer

[rahulthebuilder]

• Clarifies the explainer's external SVG image scope
• Aligns its syntax and implementation details with the latest spec draft
• Updates the README and issue template to match the new title and owner

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[Steven Becker (SteveBeckerMSFT)]

The svg-inject link is broken.

https://github.com/niclasvaneyk/svg-inject

[Steven Becker (SteveBeckerMSFT)]

This is an explainer for the entire web platform, not exclusively Chromium. I think it's good to scope this explainer to SVG images, but we should broaden these Chromium references to consider all browsers.

[Steven Becker (SteveBeckerMSFT)]

I don't know if we need to exhaustively list CSS image properties, but there are quite a few more, which will definitely become interesting test cases as we work on the implementation and WPTs:

mask-image
border-image-source
image-set
shape-outside
... and more?

[Steven Becker (SteveBeckerMSFT)]

It might be good to call out the cross-origin behavior somewhere as it relates to security/privacy. Should linked parameters apply to cross-origin external SVG images? I think the answer is yes since all rendering is handled locally.

[Steven Becker (SteveBeckerMSFT)]

Do we know Firefox's plans for the other forms of linked parameters: the URL directive and url() modifier?

[Steven Becker (SteveBeckerMSFT)]

A reminder to file a standards position request for this on WebKit if we don't have one already.