plotly/plotly.js

[BUG]: Background image is rendered at an incorrect size after box zoom followed by mouse wheel zoom out

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#7,914 opened on Jul 21, 2026

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P2buggood first issuegood for agentsize: 1

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Description

Description

On charts containing a background image with xref: "x" and yref: "y", performing a box zoom followed by a manual zoom out causes the background image to be rendered with an incorrect size and position. It no longer matches the coordinate system defined by xref and yref.

Screenshots/Video

https://github.com/user-attachments/assets/08c53c01-0fca-4845-8b59-06e837382884

Steps to reproduce

Here https://codepen.io/JulienIcon/pen/QwdBypd, try to box zoom a small part of the chart and then try to manually zoom out using the mouse wheel

Notes

If the zoom is reset using the default double-click interaction, the background image is rendered correctly again.

Contributor guide

Research direction
Investigate the zoom update logic in plotly.js, specifically how background image coordinates are recalculated after box zoom and mouse wheel zoom. Look at the 'relayout' and 'relayoutCallback' handlers, and check if image sizing is correctly updated when zoom range changes. Compare with the double click reset behavior.
Tech stack
javascript
Domain
frontend
Issue type
Bug
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.
Half day
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.
Clear
Prerequisites
JavaScriptPlotly.js basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60