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Editorial Team
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Asked: 2026-06-14T10:37:22+00:00

I’m using less file to define styles in my Web Application. Unfortunately, every time

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I’m using less file to define styles in my Web Application.
Unfortunately, every time I use the “important” declaration in Visual Studio 2012, for example:

color: #FFFFFF !important;

i get the following Warning:

Validation (CSS 3.0): "important" is not a valid value for the .... property.

But the “!important” declaration is working properly and I need to use it.
What I am doing wrong? Are there some wrong setting in VS options? I’m also using “Web Essentials 2012” extensions for VS 2012.

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1 Answer

  1. Editorial Team

    You are not doing anything wrong. I haven’t tried VS2012, but the HTML5/CSS3 validator in VS2010 was not to be trusted – I can’t remember if this was a MS or third-party add-in, but I remember the developer admitting that this was only experimental.

    I notice that you correctly write !important but that your error log writes important (without the exclamation point). Could it be that VS2012 for some odd reason skips those? You should consider filing a bug report.

    !important is certainly valid, but should be avoided in any case, as it’s hard to override. Therefore, some validators will give you a warning due to them being bad practice. Practising a slightly higher specificity to override styles will save you a lot of headache.

    TL;DR:
    Simply ignore the error and keep rocking on.

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