Prism

• Only 2KB minified & gzipped (core). Each language definition adds roughly 300-500 bytes.
• The language-xxxx class is inherited. This means that if multiple code snippets have the same language, you can just define it once,in one of their common ancestors.
• Very easy to extend without modifying the code, due to Prism’s plugin architecture. Multiple hooks are scattered throughout the source.
• Very easy to define new languages. The only thing you need is a good understanding of regular expressions.
• All styling is done through CSS, with sensible class names rather than ugly, namespaced, abbreviated nonsense.
• Wide browser support: Edge, IE11, Firefox, Chrome, Safari, Opera, most mobile browsers.
• Highlights embedded languages (e.g. CSS inside HTML, JavaScript inside HTML).
• Highlights inline code as well, not just code blocks.
• It doesn’t force you to use any Prism-specific markup, not even a Prism-specific class name, only standard markup you should be using anyway. So, you can just try it for a while, remove it if you don’t like it and leave no traces behind.

Plugins are additional scripts (and CSS code) that extend Prism’s functionality.

• Line Numbers Line number at the beginning of code lines.
• Copy to Clipboard Add a button that copies the code block to the clipboard when clicked.