# Bad value “%” for attribute “width” or “height” on element “object”: Expected a digit but saw “%” instead. > Canonical HTML version: https://rocketvalidator.com/html-validation/bad-value-x-for-attribute-width-or-height-on-element-object-expected-a-digit-but-saw-percentage-instead > Attribution: Rocket Validator (https://rocketvalidator.com) > License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) According to the [HTML Living Standard](https://html.spec.whatwg.org/multipage/iframe-embed-object.html#the-object-element), the `width` and `height` attributes on the `` element accept only valid non-negative integers — plain numbers representing pixels, such as `600` or `400`. The validator expects each character in the value to be a digit (0–9). When it encounters a `%` sign, it reports "Expected a digit but saw '%' instead." This is different from some legacy HTML 4 behavior where certain elements accepted percentage values in dimension attributes. In modern HTML, the `` element's dimension attributes are strictly pixel-only. The same restriction applies to elements like ``, `