w3c/csswg-drafts

[cssom-view] Should browser zoom affect screen.width?

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#399 opened on Aug 11, 2016

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Description

In Firefox and IE/Edge, the browser's zoom level affects screen.width (so that as you increase the zoom, the reported value of screen.width decreases). In Chrome and Safari, it does not.

The spec says:

The width attribute must return the width of the output device, in CSS pixels.

My reading of this is that, since it says "in CSS pixels", Firefox and IE/Edge's behaviour is correct (since zooming in decreases the number of CSS pixels that fit onto the screen).

Due to the implementation divergence, I'd like to double check: is this the intended interpretation?

Contributor guide

Research direction
Compare browser behaviors and spec text to determine if screen.width should change with zoom.
Tech stack
None
Domain
frontend
Issue type
Research
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
CSSSpecification reading
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70