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Editorial Team
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Editorial Team
Asked: June 8, 20262026-06-08T18:07:02+00:00 2026-06-08T18:07:02+00:00

I am using box-sizing with vendor prefixes, like this …running it through the CSS

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I am using box-sizing with vendor prefixes, like this

…running it through the CSS validator

…and getting this error:
Property -moz-box-sizing doesn’t exist : border-box

Is there a way to make it pass?

Many thanks.

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  1. Editorial Team
    Editorial Team
    2026-06-08T18:07:03+00:00Added an answer on June 8, 2026 at 6:07 pm

    No. CSS3 is in BETA mode, browsers need to have prefixes because some properties have different values. In the future this will be one standard, the W3C CSS level 3 standard. Then the prefixes will be removed.

    However, we need to use prefixes today and prefixes aren’t really CSS, they are just an indicator for a browser which of the properties it will parse. And because they aren’t CSS the CSS validator wouldn’t pass.

    But a ‘valid’ page doesn’t say anything. Don’t worry about some errors in your CSS/HTML, fix only the ones who are critical.

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