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<html><head><script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script><script>$(document).ready(function(){ $("button").click(function(){ $("p").offsetParent().css("background-color", "red"); });});</script></head><body><button>Set background-color</button><div style="border:1px solid black;width:70%;position:absolute;left:10px;top:50px"><div style="border:1px solid black;margin:50px;background-color:yellow"><p>Click button to set the background color of the first positioned parent element of this paragraph.</p></div></div></body></html>