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CSS for when JavaScript is Enabled

document.documentElement.className = "js"

This adds a class to the root <html>, so you could (for example) do something like hide a <div> only when JavaScript is enabled.

.js div#id { display: none; }

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  1. This doesn’t add a class to the body; it adds a class to the root element (i.e. the “html” tag)…

  2. The jQuery version of this (not that you really need it, but if you’re using it anyway) is:

    $("body").addClass("js");

    I always put it right up top, with anything else that’s generic. I also usually use the class “has-js” just because a two-letter class name makes me nervous (plugins or whatnot) and it’s an eensy bit more meaningful.

  3. I have an additional trick for you guys; Alongside this class being Added to the body, I Remove a class that was in the body tag. So a user withOut JS will get
    <body class="xhtml">
    while a user With JS turned on will get
    <body class="js">
    ( … by removing the class ‘xhtml’ and adding ‘js’ )

    = By having a default class in the body tag it makes things easier to do “flash on load” fixes like when replacing links with Flash-content f.i., plus I find that it simplifies and prettifies the CSS a whole lot ;)

  4. I use it often to open all hidden menus, and collapse when js is enabled.

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