1638188 - `load` and `error` events are not fired for [rel=icon] links

Status: NEW

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

Description

[Mike Pennisi [:jugglinmike]]

Attachment: 2020-05-14-icon-onload.html

Steps to reproduce:

1. Open the attached document in the browser

Expected results: The text "onload" should be visible on the screen

Actual results: no text is displayed

Reviewing the activity in the Network tab of the Developer's Console shows that
a request is made.

Relevant specification text:

https://html.spec.whatwg.org/multipage/links.html#rel-icon

The "icon" link type does not define its own "fetch and process the linked
resource" algorithm, so the default algorithm should be used

https://html.spec.whatwg.org/multipage/semantics.html#fetch-and-process-the-linked-resource

Bug 563176 has a similar-sounding title, but the content is actually focused on [rel=stylesheet] specifically.

Comment 1

[Kagami Rosylight [:saschanaz] (they/them)]

Attachment: with-bugzilla-icon.html

Comment 2

[Kagami Rosylight [:saschanaz] (they/them)]

Bugzilla throws a CSP error so I got a plnkr instead: http://plnkr.co/edit/pqKn5JghM9YLMYmI?open=lib%2Fscript.js&preview

Couldn't make it work neither on Firefox nor Chrome though. Anne, does the spec requires this to work?

Comment 3

[Anne (:annevk)]

As Mike points out it does, but that change might not have been made with as much tests as it needed. It seems that a user agent should be allowed not to fetch at all if it does not need an icon or already has one or if the page points at multiple and only one is suitable. So some amount of custom steps ought be added.