1718781 - When href is missing from a preload link it ignores imagesrcset

Status: UNCONFIRMED

(Core :: DOM: Core & HTML, defect, P3)

Description

[derekmj74]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:90.0) Gecko/20100101 Firefox/90.0

Steps to reproduce:

I've shortened the image names but apart from that I used this HTML:

<link rel="preload" imagesrcset="small.jpg 100w, medium.jpg 500w, large.jpg 1000w" imagesizes="100vw" as="image">

Actual results:

The image did not preload.

Expected results:

I think this line "One or both of the href or imagesrcset attributes must be present." from https://html.spec.whatwg.org/multipage/semantics.html#the-link-element means the href can be absent and the preloading will still work. I tested in Chrome and Edge and it works there.

In Firefox I have to use an empty href i.e. href="", which the spec disallows if I'm reading it right.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::DOM: Core & HTML' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.