Pretty HTML | CSS | XML Chrome 插件, crx 扩展下载

                    
A simple way to format your  HTML, CSS, or XML code for easier reading!
A utility to format (pretty print) HTML, XML, or CSS source code. Ideal if you want a quick way to tidy up your content for easier reading. 

Just type or paste your source and see the formatted version appear in a separate panel. This utility attempts to auto-detect the format of your source content and format it appropriately. Your source is remembered so that when you open the extension again your source will still be available. A copy button allows you to copy your formatted content to the clipboard. You can Replace your source content with the formatted version with a button click. Paste and Append buttons allow you to paste into the source text area.