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Why won't my function execute?

I have this code, and body

<body onload="mail_receive()">

won't execute it.

function mail_receive() {
    document.getElementById("w")="mail receive";
}

It won't show in

<div id="w"></div>

You can't assign a string value to a DOM element and expect it to work. (In fact you probably can't use the result of a function call as an lvalue in Javascript to begin with.)

Try

document.getElementById('w').innerHTML = 'Mail received';

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