переменные в HTML
<var>This text will be italicized</var>
Orion
<var>This text will be italicized</var><script>var screenWidth = screen.width;</script>
...
<img src="images/title.png" onload="this.width=screenWidth;" style="margin-top: 3%"><!DOCTYPE html>
<html>
<head>
<title>HTML var Tag</title>
</head>
<body>
<p>The equations: <var>2x</var> - <var>4z</var> = <var>2y</var> + 3 and
<var>x</var> + <var>5z</var> = <var>3y</var> + 6</p>
</body>
</html>