Success Criterion 1.4.4
Conformance level AA

Fixed Line Height Causing Enlarged Text to Overlap Itself

1.4.4 — Resize Text

Scenario

Setting

An online marketplace's seller dashboard

What’s wrong

Line-height fixed in px so enlarged glyphs overlap vertically.

Example

html { font-size: 14px; } /* fixed px, breaks at 200% browser zoom */

Why it matters

Low-vision people who enlarge text instead of using a screen reader.

How to test

Set zoom to 200% and check multi-line text: if line-height is fixed in px, enlarged glyphs overlap the line above/below.

How to fix

At 200% text size/zoom, all content and controls must remain visible, readable, and usable — nothing clipped, overlapped, or lost. html { font-size: 100%; } body { font-size: 1rem; } /* scales with zoom */ Text sized in rem/em scales when the user zooms; hard-coded pixel sizes can get clipped or overlap.

Outcome

On an online marketplace's seller dashboard, this barrier is gone for low-vision people who enlarge text instead of using a screen reader — they can complete the task without hitting this wall.

Who is affected