[Page attachments][Outlink] Option to get domain favicon

[processprocess]

A service can be used to fetch the outlink domain's favicon.
This could be a value for cta-image like cta-image="favicon"

If the domain does not have a favicon configured, this could fallback to the default link icon.

prototype
Replace the faviconURL param with any domain to preview the feature.

Concept approved by @hongcatlover

@ampproject/wg-stories

[newmuis]

I think we should seriously consider making this the default, instead of an additional parameter.

/cc @hongcatlover @raovs @gmajoulet

[processprocess]

I think we should seriously consider making this the default, instead of an additional parameter.

I'm leaning in that direction also.

• It feels like it would align with expectations of what the image's function is.
• It would give a story with multiple outlink buttons more variation by default without configuration.

[processprocess]

I'm not sure how we could detect if we need to default to a fallback if we use this service though.
The request seems the same when it successfully gets a favicon and when it doesn't.

[mszylkowski]

The size of the icon when it fails is independent of the variable, maybe it's possible to catch this? Check the document title also, it says (16x16) even if the ?sz=64

[stale]

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