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<html>
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<head>
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<style>
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.btn
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{
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padding:10px;
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background-color:#007bff;
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border:none;
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color:white;
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}
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</style>
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</head>
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<body>
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<h1>JavaScript on load event</h1>
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<p>body background will changed after page loaded</p>
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<button class="btn">Click</button>
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<script>
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window.addEventListener('load',()=>{
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document.body.style.backgroundColor = "gray";
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});
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</script>
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</body>
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</html>