Edit fiddle - JSFiddle - React, Tailwind, and code Playground

JSFiddle - React, Tailwind, and code Playground

HTML

<span class="label">Prix: </span><input type="text" id="prix" value="" /> <br/>
<span class="label">qte:</span><input type="text" id="qte" value="0" /><br/>
<span class="label">Total:</span><input type="text" id="total" value="" />

CSS

.label { display: inline-block;
          width: 80px;}
input { text-align: right;}

JavaScript

function RefreshPrix(){
prix= +document.getElementById('prix').value;
qte=+document.getElementById('qte').value;
document.getElementById('total').value= ( prix*qte)
}
document.getElementById('prix').onkeyup=RefreshPrix
document.getElementById('qte').onkeyup=RefreshPrix

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