Less.js2.6.0發布，CSS預處理器_html/css

Underscore now allowed in dimension unit

Fixes for import by reference

Fix for #2384 Changes HTTPRequest "sync" setting to simply hide the page until less has rendered, browser version is now orders of magnitude faster.

Added ability to cache stylesheets while using modifyVars

Error when when image-size functions are used in browser-less

Fixed extend leaking through nested parent selector. #2586

Added "or" keyword and allowed arbitrary logical expression in guards

Fixing #2124 - Parsing Error "Unrecognised input" for color operations

Logical operator and now has higher precence then logical operator or .

Allow unknown at-rules w/o {} block