# Text Spacing Overrides: What Happens When Users Set Their Own Line Height

Source: https://accesswatchhq.com/blog/2026-11-09-text-spacing-overrides-line-height-1-4-12.html

November 9, 2026

*A reader with low vision opens your browser settings and sets line height to 1.5, paragraph spacing to double, letter spacing a little wider. Your layout responds by clipping the third line of every product title, overlapping the price onto the description, and hiding the add to cart button behind a fixed-height card. Nothing crashed. The content is just gone.*

## The four numbers in 1.4.12

Success Criterion 1.4.12, Text Spacing, is Level AA, and it is unusually specific about what it requires. Content must survive four spacing settings applied at once: line height of at least 1.5 times the font size, paragraph spacing of at least 2 times the font size, letter spacing of at least 0.12 times the font size, and word spacing of at least 0.16 times the font size. No loss of content or functionality. That last phrase is the test: text can reflow and wrap, but it cannot disappear, overlap, or become unreachable.

Users set these values in browser settings, in extensions, or through their operating system, and they set them because the default spacing is hard for them to read. This is not a theoretical preference. It is a real adjustment real people make, and the criterion exists because fixed-height layouts were quietly eating their content.

## Fixed heights are the cause, every time

Nearly every 1.4.12 failure traces to the same two habits. The first is a fixed height on a text container: a card, a banner, or a button with height set in pixels and overflow hidden. Widen the spacing and the text outgrows the box, and the overflow rule clips it. The fix is min-height instead of height, or no height at all, so the container grows with its content.

The second is absolute positioning used to pin text into a designed slot. A price pinned to the bottom of a card, a badge pinned over an image, a label pinned beside an input: widen the spacing and the pinned text overlaps its neighbor or slides out of its slot. The fix is flow layout with margins, not coordinates. Related: the zoom problem we covered in [Zoom to 200 Percent: What Breaks When Text Gets Bigger](https://accesswatchhq.com/blog/2026-11-08-zoom-200-percent-what-breaks-text-bigger.md), which is the same class of failure at a different scale.

## The test takes five minutes

Open the page in a browser, apply the four spacing values with a bookmarklet or an extension, and look. The W3C publishes a text spacing bookmarklet for exactly this, and most accessibility toolbars include one. Check the product grid, the cart, and the checkout form, because those are the places fixed heights hide. Any text that clips, overlaps, or disappears is a 1.4.12 failure, and the fix is almost always removing a height or an overflow rule, not redesigning the page.

Run the test on the templates that carry money, not just the homepage. The product grid is where fixed-height cards hide, the cart is where pinned prices overlap, and the checkout form is where a fixed-height input clips its own label. Test each at the widths your customers use, because a layout that survives wider spacing on a laptop can still break on a phone, where the same fixed heights meet narrower columns. The W3C bookmarklet applies all four values at once, which is the point: the criterion requires the content to survive the combination, not each value in isolation.

One caveat worth naming: the criterion does not require your design to look identical at wider spacing. It requires the content to remain available and usable. A card that grows taller is fine. A button that wraps to two lines is fine. What is not fine is content a user cannot reach because the box it lives in refused to grow. For the filings context on why these details draw complaints, see [Watching ADA Filings: Ecommerce Share in 2025](https://accesswatchhq.com/blog/2026-11-07-watching-ada-filings-ecommerce-share-2025.md).

## Frequently asked questions

### What spacing values does WCAG 1.4.12 require content to survive?

Line height of 1.5 times the font size, paragraph spacing of 2 times, letter spacing of 0.12 times, and word spacing of 0.16 times, all applied at once, with no loss of content or functionality.

### What is the most common cause of text spacing failures?

Fixed heights with overflow hidden on text containers. When spacing widens, the text outgrows the box and gets clipped. Using min-height instead of height, or no height at all, fixes most cases.

### Do I have to keep the design looking the same at wider spacing?

No. The criterion requires content to remain available and usable, not identical. Cards growing taller and buttons wrapping to two lines are fine. Text disappearing or overlapping is not.

### How do I test text spacing quickly?

Use the W3C text spacing bookmarklet or an accessibility toolbar to apply all four values at once, then check the product grid, cart, and checkout for clipped or overlapping text.