w3c/csswg-drafts

[cssom-view] API for final dimension / position of object-fit items

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#1,779 opened on Sep 5, 2017

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Description

As it is now, there is no way to detect the final position and dimension of a object-fit element.

This is particularly problematic for things like canvas, where sometimes mapping mouse coordinates is needed.

Would it be possible for GetComputedStyle to return the top,right,bottom,left of the fit?

Contributor guide

Tech stack
csshtmljavascript
Domain
apifrontend
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
over 1 week
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.
clear
Prerequisites
CSS object fit propertyCSSOM specification
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
15
Research direction
Investigate the CSSOM specification for element resize and position. Examine the object fit property's rendering algorithm to understand how final dimensions are computed. Review any existing proposals or use cases for exposing these coordinates. Consider how this could be implemented as an extension to getComputedStyle.