TAG
JavaScript
Result
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License
<button type="button" id="btn-add"><h2>Add span once!</h2></button>
"use strict"; window.addEventListener("load", function() { var elAddBtn = document.querySelector("#btn-add"); elAddBtn.addEventListener("click", function handler() { var addSpan = document.createElement("span"); addSpan.textContent = "Hello"; addSpan.style.marginRight = "20px"; this.before(addSpan); this.removeEventListener("click", handler); }); });
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License
License
by DevDic
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