- [Install](#install)
- [Use](#use)
* [Important: 4.0 breaking changes](#important-40-breaking-changes)
- * [What's coming in version 4.1](#whats-coming-in-version-41)
+ * [What's new in version 4.1](#whats-new-in-version-41)
* [Constructor options](#constructor-options)
* [Compatibility modes](#compatibility-modes)
* [Fetch option](#fetch-option)
* `sourceMap` option has to be a boolean from now on - to specify an input source map pass it a 2nd argument to `minify` method or via a hash instead;
* `aggressiveMerging` option is removed as aggressive merging is replaced by smarter override merging.
-## What's coming in version 4.1
+## What's new in version 4.1
-Once released clean-css 4.1 will introduce the following changes / features:
+clean-css 4.1 introduces the following changes / features:
* `inline: false` as an alias to `inline: ['none']`;
* `multiplePseudoMerging` compatibility flag controlling merging of rules with multiple pseudo classes / elements;
* `skipProperties` flag in level 2 optimizations controlling which properties won't be optimized;
* new `animation` shorthand and `animation-*` longhand optimizers;
* `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;
+* 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.
## Constructor options