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The following is a code block with JavaScript language syntax highlighting.

import React from 'react';

Supports multiple languages.

The following is a code block with diff. Lines with

+
highlighted in green shade indicating an addition. Lines with
-
highlighted in red shade indicating a deletion.

- const data = ['1','2'];
+ const data = [1,2];

Live Editing example

<button className={'btn btn-default'}>Change my text</button>