Si la valeur du champ (porte par l'attribut value est infrieure ce seuil, l'lment ne pourra tre valid (en-US). Ici, on a utilis les pseudo-classes :invalid et :valid afin d'afficher une icne selon le cas, ct de l'lment adjacent. If the value entered into the element is later than this timestamp, the element fails constraint validation. Depending on your needs, you can use the min The returnFileSize() function takes a number (of bytes, taken from the current file's size property), and turns it into a nicely formatted size in bytes/KB/MB. Note: You can set as well as get the value of HTMLInputElement.files in all modern browsers; this was most recently added to Firefox, in version 57 (see bug1384030). elements with type="file" let the user choose one or more files from their device storage. You can activate the input element by clicking its