files/en-us/web/api/htmlinputelement/alt/index.md
{{APIRef("HTML DOM")}}
The alt property of the {{DOMxRef("HTMLInputElement")}} interface defines the textual label for the button for users and user agents who cannot use the image. It reflects the {{htmlelement("input")}} element's alt attribute.
The alt property is valid for the image type only. It should be a non-empty string giving the label that would be appropriate for an equivalent button if the image was unavailable.
A string.
const inputElement = document.getElementById("imageButton");
console.log(inputElement.alt);
inputElement.alt = "A much better description";
{{Specifications}}
{{Compat}}