HTML Validation

CSS: “padding-right”: “px” is not a “padding-right” value.

About This HTML Issue

The padding-right property in CSS requires a numerical value followed by a unit. For example, pixels (px), percentages (%), em units (em), etc. Setting padding-right: px without a number is invalid.

To fix the issue, specify a numerical value before the unit. Here’s how you can correct this:

Example of incorrect HTML with inline CSS:

<div style="padding-right: px;">Content</div>

Corrected HTML with inline CSS:

<div style="padding-right: 10px;">Content</div>

In the above example, 10px is a valid value.

Alternatively, if using an external CSS file, the incorrect CSS might look like this:

.example {
  padding-right: px;
}

Correct the external CSS by specifying a numerical value:

.example {
  padding-right: 10px;
}

Learn more:

→ MDN: padding-right

Last reviewed: September 23, 2024

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Related W3C Validator Issues

Bad value X for attribute “media” on element “link”: Deprecated media feature “max-device-width”. For guidance, see the Deprecated Media Features section in the current Media Queries specification.

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The width media feature describes the width of the targeted display area of the output device. For continuous media, this is the width of the viewport including the size of a rendered scroll bar (if any).

In the following example, this media query expresses that the style sheet is only linked if the width of the viewport 768px maximum:

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Bad value X for attribute “media” on element “link”: Deprecated media feature “min-device-width”. For guidance, see the Deprecated Media Features section in the current Media Queries specification.

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Bad value X for attribute “sizes” on element “img”: Bad CSS number token: Expected a minus sign or a digit but saw “a” instead at “auto,”.

The sizes attribute for an img element requires valid CSS syntax, and auto is not an acceptable value within that attribute.

The sizes attribute allows you to specify a list of media conditions and corresponding sizes for the images. Each condition determines which size of the image should be displayed at different viewport widths, ensuring responsive image delivery. The syntax for sizes should be a comma-separated list of media queries followed by a value denoting the corresponding width of the image. This width value may be in pixels (px) or as a percentage (vw, vh), but auto is not valid in this context.

Here is a breakdown of a correct sizes attribute usage:

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Remove “auto” from your sizes value and provide a valid, contextually correct CSS value.

Example

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Responsive Images Example</title>
</head>
<body>
  <img
    src="image.jpg"
    sizes="(max-width: 472px) 100vw, 472px"
    srcset="image-small.jpg 300w, image-medium.jpg 600w, image-large.jpg 1000w"
    alt="A description of the image"
  >
</body>
</html>

In this example, if the viewport width is less than or equal to 472 pixels, the image will take up the entire width (100vw). For larger widths, the srcset specifies different image files for varying resolutions.

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