whatwg/html

Unclear if error event from "update the image data" matches implementations

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#3,839 opened on Jul 22, 2018

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good first issuetopic: img

Description

Attempting to verify the behaviour of step 10 of update the image data, I ran this test in Firefox, Safari, and Chrome on macOS. Each browser only displayed "error1". As far as I can tell img elements with either a srcset attribute or a picture parent should cause the algorithm to be invoked, and then end up with a null selected source. This doesn't appear to match the behaviour of any browser I've tried, however.

cc @zcorpan

Contributor guide

Tech stack
None
Domain
frontend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
3-5 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
needs investigation
Prerequisites
understanding of HTML specificationbrowser testing experience
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
20
Research direction
Investigate step 10 of the 'update the image data' algorithm in the HTML spec. Test the provided live DOM viewer example across browsers to confirm behavior. Discuss with maintainers (e.g., @zcorpan) to clarify the intended behavior and update the spec accordingly.
Unclear if error event from "update the image data" matches implementations · whatwg/html#3839 | Good First Issue