# Live CSS Update

DevFeed: [Live CSS Update](<https://devfeed.tech/articles/live-css-update-19353.md>)

Original publisher: [Read original article](<https://www.codenameone.com/blog/live-css-update/>)

Author: Shai Almog

Published: 2018-05-14T00:00:00Z

Content type: release

Language: en

Sources: [CodeName One](<https://devfeed.tech/sources/codename-one.md>)

Topics: [CSS](<https://devfeed.tech/topics/css.md>), [Web Development](<https://devfeed.tech/topics/web-development.md>), [WebKit](<https://devfeed.tech/topics/webkit.md>)

Tags: [css](<https://devfeed.tech/tags/css.md>), [features](<https://devfeed.tech/tags/features.md>), [guide](<https://devfeed.tech/tags/guide.md>), [improvements](<https://devfeed.tech/tags/improvements.md>), [release](<https://devfeed.tech/tags/release.md>), [speed](<https://devfeed.tech/tags/speed.md>), [update](<https://devfeed.tech/tags/update.md>)

## AI overview

Codename One 4.2 makes CSS a core feature and adds live CSS updates in the simulator. A watcher thread recompiles and deploys CSS changes automatically when files are saved, while installation and migration from older CSS support are simplified. The article also describes faster CSS processing and notes remaining work around documentation, localization, demos, tutorials, and project creation.

## Source excerpt

Up until last Friday CSS support has been a second class citizen, with the release of Codename One 4.2 we're making CSS a core feature. We also improved the builtin CSS support extensively! Changes you make to a CSS file will instantly reflect in the simulator. You don't need to compile or do anything special. When you launch the simulator we open a CSS watcher thread that automatically recompiles & deploys the CSS whenever you save.