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<html><head><style>#ex1 { color: red;}</style></head><body><h1>The setProperty() Method</h1><p>Click the button to set a new CSS property.</p><button onclick="myFunction()">Try it</button><div id="ex1">Some text.</div><script>function myFunction() { var declaration = document.styleSheets[0].cssRules[0].style; var setprop = declaration.setProperty("background-color", "yellow");}</script></body><!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_cssstyle_setproperty by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 18:00:19 GMT --></html>