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@hint/hint-css-prefix-order

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@hint/hint-css-prefix-order

Ensure vendor-prefixed versions of a CSS property are listed before the unprefixed version.

  • 1.2.7
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  • npm
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Prefixed CSS first (css-prefix-order)

Ensure vendor-prefixed versions of a CSS property are listed before the standardized, unprefixed version.

Why is this important?

When multiple versions of the same CSS property are specified, the last supported one will be used due to how browsers handle fallback values. This means the order matters when using both vendor-prefixed and unprefixed versions of the same property. Specifically, the unprefixed version must be listed last to ensure standardized behavior takes precedence.

What does the hint check?

This hint examines CSS files looking for blocks containing both prefixed and unprefixed CSS properties or values. The hint then verifies the last listed version of a particular property in a block is unprefixed.

Examples that trigger the hint

appearance: none;
-moz-appearance: none;
-webkit-appearance: none;
display: grid;
display: -ms-grid;

Examples that pass the hint

-moz-appearance: none;
-webkit-appearance: none;
appearance: none;
display: -ms-grid;
display: grid;

How to use this hint?

To use it you will have to install it via npm:

npm install @hint/hint-css-prefix-order

Note: You can make npm install it as a devDependency using the --save-dev parameter, or to install it globally, you can use the -g parameter. For other options see npm's documentation.

And then activate it via the .hintrc configuration file:

{
    "connector": {...},
    "formatters": [...],
    "parsers": [...],
    "hints": {
        "css-prefix-order": "error"
    },
    ...
}

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Package last updated on 19 Sep 2019

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