Полезные коды для сайта- Белнет 24

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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
img {
-webkit-filter: grayscale(100%); /* Safari 6.0 - 9.0 */
filter: grayscale(100%);
}
</style>
</head>
<body>

<p>Convert the image to grayscale:</p>

<img src="pineapple.jpg" alt="Pineapple" width="300" height="300">

<p><strong>Note:</strong> The filter property is not supported in Internet Explorer, Edge 12, or Safari 5.1 and earlier.</p>

</body>
</html>