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Javascript – Recursive function to change opacity (efect fadein with pure js)

Why this code is not changing opacity value in progress? function fadeIn(arg_idElemHtml,arg_opacityValue) { if(arg_opacityValue < 1){ var objHtml = document.getElementById(arg_idElemHtml); objHtml.style.display = 'block'; objHtml.style.opacity = arg_opacityValue + 0.1; arg_opacityValue = parseFloat(arg_opacityValue) + 0.1; setTimeout(fadeIn(arg_idElemHtml,arg_opacityValue), 400); } } #msg {background-color:red;display:none;opacity:0.0} <button…

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