Can I disable a CSS :hover effect via JavaScript?

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There isn’t a pure JavaScript generic solution, I’m afraid. JavaScript isn’t able to turn off the CSS :hover state itself.

You could try the following alternative workaround though. If you don’t mind mucking about in your HTML and CSS a little bit, it saves you having to reset every CSS property manually via JavaScript.

HTML

<body class="nojQuery">

CSS

/* Limit the hover styles in your CSS so that they only apply when the nojQuery 
class is present */

body.nojQuery ul#mainFilter a:hover {
    /* CSS-only hover styles go here */
}

JavaScript

// When jQuery kicks in, remove the nojQuery class from the <body> element, thus
// making the CSS hover styles disappear.

$(function(){}
    $('body').removeClass('nojQuery');
)

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