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CSS
JavaScript
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<form> <input type="text" id="userid" name="userid" /> </form>
form { padding: 10px; }
document.addEventListener("DOMContentLoaded", () => { const $elUserid = document.getElementById("userid"); $elUserid.addEventListener("focus", e => { const $elForm = e.currentTarget.form; $elForm.style.backgroundColor = "yellow"; }); });
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by DevDic
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