css generated content

ANSI character set and equivalent Unicode and HTML characters - .index ul li.on:before{content: "\00AB"; color: gray;}, content裡面的內容如果是html entities，必須 escape 該 content 的 unicode value:

« 171 171 0xAB U+00AB « left-pointing double angle quotation mark Latin-1 Supplement

HTML Codes - Table of ascii characters and symbols
keycode: after before css generated content unicode