This page demonstrates CodeMirror's JavaScript parser. Note that the ugly buttons at the top are not are not part of CodeMirror proper -- they demonstrate the way it can be embedded in a web-application.

// Here you see some JavaScript code. Mess around with it to get // acquainted with CodeMirror's features. // Press enter inside the object and your new line will be suitably // indented. var keyBindings = { enter: "newline-and-indent", tab: "reindent-selection", ctrl_z: "undo", ctrl_y: "redo", ctrl_backspace: "undo-for-safari (which blocks ctrl-z)", ctrl-bracket: "highlight-brackets", ctrl-shift-bracket: "jump-to-matching-bracket" }; // Press tab on the next line and the wrong indentation will be fixed. var regex = /foo|bar/i; function example(x) { // Local variables get a different colour than global ones. var y = 44.4; return x + y - z; }