Does JS-injected <link rel=amphtml> trigger AMP document discovery?

[ithinkihaveacat]

https://www.ampproject.org/docs/reference/spec#amp-document-discovery explains that AMP documents are linked with their associated canonicals via the <link rel="amphtml"> tag.

Can JS be used to dynamically inject this code? i.e. via something like:

const e = document.createElement("link");
e.href = 'http://example.com/amp/something';
e.rel = 'amphtml';
document.head.appendChild(e);

(I assume the answer is no, but it might be worthwhile making it clear in the docs.)

[cramforce]

This depends entirely on the crawler. For some the answer will be that it
works and for some the answer will be that it doesn't work.

On Tue, Nov 8, 2016 at 9:09 AM, Michael Stillwell notifications@github.com
wrote:

https://www.ampproject.org/docs/reference/spec#amp-document-discovery
explains that AMP documents are linked with their associated canonicals via
the tag.

Can JS be used to dynamically inject this code? i.e. via something like:

const e = document.createElement("link");e.href = 'http://example.com/amp/something';e.rel = 'amphtml';document.head.appendChild(e);

(I assume the answer is no, but it might be worthwhile making it clear in
the docs.)

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[jridgewell]

Should we clarify this?

[ithinkihaveacat]

Not holding @cramforce to this but I just discovered a previous related comment: "Lets just decide that JS injection is not OK." (Nov 2015)

(And yes, I think some sort of clarification (even if it's "crawler-dependent but might work") would be useful.)

[cramforce]

@ithinkihaveacat Could you send a PR?

[ericlindley-g]

@ithinkihaveacat I think I can close this with the PR merged, but please reopen if there's outstanding work. Thanks!