GitHub markdown/HTML: lazy loading images

[fballiano]

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When you insert an image in a textfield (or in a README file), sometime you'd like to have lazy loading for images (ex: the contributors list in a project's README can have megabytes of images downloaded at every request) but if you write something like this:

<img src="https://user-images.githubusercontent.com/909743/209436052-7e97fecf-2cc8-4795-bbc6-eb227347273c.jpg" loading=lazy />

the output will be sanitized and the loading attribute will be removed, eg:

If would be nice (actually it would be quite necessary in 2023) to have the loading attribute not stripped away.

:-)

[johnnyreilly]

It would be amazing to have this! Posting here after investigating JoshuaKGoldberg/create-typescript-app#1312