- Success Criterion 1.4.4
- Conformance level AA
Canvas-Rendered Text That Ignores Browser Zoom Completely
1.4.4 — Resize Text
Scenario
Setting
A video-conferencing app's meeting controls
What’s wrong
Canvas-rendered text that ignores browser zoom/text scaling entirely.
Example
On a video-conferencing app's meeting controls, a visitor hits this wall: canvas-rendered text that ignores browser zoom/text scaling entirely.
Why it matters
Low-vision people who enlarge text instead of using a screen reader. On a video-conferencing app's meeting controls, this barrier means they can't read the text against its background.
How to test
Set browser zoom to 200% on any canvas-rendered text: canvas text ignores browser zoom entirely and won't scale — confirm by comparing rendered size before/after zoom.
How to fix
At 200% text size/zoom, all content and controls must remain visible, readable, and usable — nothing clipped, overlapped, or lost.
Outcome
Corrected, a video-conferencing app's meeting controls now lets a visitor see the control's boundary and current state.
Who is affected
Low-vision people who enlarge text instead of using a screen reader.
Learn more
- Understanding Understanding document (opens in a new tab)
Related scenarios
- Text and Controls That Get Cut Off at 200% Zoom
- Form Fields That Don’t Grow When Text Is Enlarged
- Font Size Set in Viewport Units That Ignores Browser Zoom
- Viewport Meta Tag That Disables Pinch-to-Zoom on Mobile
- Fixed-Height Containers That Clip Content at 200% Zoom
- Button or Nav Text That Overflows Its Fixed-Size Container