--- title: "You might need to know about the CSS lh unit" url: https://daily.dev/posts/you-might-need-to-know-about-the-css-lh-unit-zsbx52ajp source_url: https://ishadeed.com/article/css-line-height-unit type: article source: "Ahmad Shadeed" published: 2026-08-01T14:03:34.074Z updated: 2026-08-02T05:18:00.978Z tags: ["webdev", "css"] reading_time: 6 upvotes: 2 comments: 1 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # You might need to know about the CSS lh unit **[Ahmad Shadeed](https://daily.dev/sources/ishadeed)** · 6 min read · 2 upvotes · 1 comments ## Summary The CSS `lh` unit equals the computed value of the `line-height` property and enables several practical layout techniques. Use cases covered include: setting paragraph margins proportional to line height, creating paper-line background effects that stay aligned when font size changes, rounding floated image heights to the nearest text line using `calc-size()` and `round()`, limiting list height to an exact number of lines with a matching fade mask, and sizing button icons relative to text. The unit solves problems that previously required pixel hacks or were difficult to maintain across font size changes. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Community discussion Top comments from developers on daily.dev. **@agustinbarrientos** · 0 upvotes > The lined-paper demo finally gave me a reason to remember `lh`. ## Similar posts on daily.dev - [The Best CSS Unit Might Be a Combination](https://daily.dev/posts/the-best-css-unit-might-be-a-combination-3oswqao3v) · OddBird · 2 upvotes · 0 comments --- Tags: [#webdev](https://daily.dev/tags/webdev), [#css](https://daily.dev/tags/css) [View this post on daily.dev](https://daily.dev/posts/you-might-need-to-know-about-the-css-lh-unit-zsbx52ajp)