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/* I know i already made a HOW TO MAKE CSS TEXT ITALIC but here's one
100% css */
#italic-selector {font-style:italic;}
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font-style: normal;
font-style: italic;
font-style: oblique;
font-style: oblique 10deg;
/* global values */
font-style: inherit;
font-style: initial;
font-style: unset;
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<!DOCTYPE html>
<html lang="en">
<head>
</head>
<body>
<p><i>Hello World</i></p>
</body>
</html>