- [Use](#use)
* [Important: 4.0 breaking changes](#important-40-breaking-changes)
* [What's new in version 4.1](#whats-new-in-version-41)
+ * [What's new in version 4.2](#whats-new-in-version-42)
* [Constructor options](#constructor-options)
* [Compatibility modes](#compatibility-modes)
* [Fetch option](#fetch-option)
* `removeUnusedAtRules` level 2 optimization controlling removal of unused `@counter-style`, `@font-face`, `@keyframes`, and `@namespace` at rules;
* the [web interface](https://jakubpawlowicz.github.io/clean-css) gets an improved settings panel with "reset to defaults", instant option changes, and settings being persisted across sessions.
+## What's new in version 4.2
+
+clean-css 4.2 will introduce the following changes / features:
+
+TBD
+
## Constructor options
clean-css constructor accepts a hash as a parameter with the following options available:
{
"name": "clean-css",
- "version": "4.1.3",
+ "version": "4.2.0-pre",
"author": "Jakub Pawlowicz <contact@jakubpawlowicz.com> (http://twitter.com/jakubpawlowicz)",
"description": "A well-tested CSS minifier",
"license": "MIT",