How do you get and set CSS custom properties (those accessed with var(…) in the stylesheet) using JavaScript (plain or jQuery)?
Here is my unsuccessful try: clicking on the buttons changes the usual font-weight property, but not the custom --mycolor property:
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.0/jquery.min.js"></script>
<style>
body {
--mycolor: yellow;
background-color: var(--mycolor);
}
</style>
</head>
<body>
<p>Let's try to make this text bold and the background red.</p>
<button onclick="plain_js()">Plain JS</button>
<button onclick="jQuery_()">jQuery</button>
<script>
function plain_js() {
document.body.style['font-weight'] = 'bold';
document.body.style['--mycolor'] = 'red';
};
function jQuery_() {
$('body').css('font-weight', 'bold');
$('body').css('--mycolor', 'red');
}
</script>
</body>
</html>
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