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Editorial Team
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Asked: 2026-05-26T12:00:31+00:00

I have an MVC app. I was trying to get some gradients working for

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I have an MVC app. I was trying to get some gradients working for IE 8 so I added:

filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#E65C00', endColorstr='#FFB280');

This was working fine for a while. Now my app won’t compile and is saying:

Validation (CSS 2.1): ‘filter’ is not a known CSS property name

This was not an issue before but now is. Strange.

I’m new to CSS 3 but I’m thinking the problem is probably Visual Studio is trying to compile to this CSS 2.1. Am I right? How would I set it up to validate for CSS 3?

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1 Answer

  1. Editorial Team

    ‘filter’ property is a proprietary Microsoft CSS extension. This is not the part of CSS 2.1 specification. See this.

    You can turn off CSS validation errors in Visual Studio from menu: – Tools > Options. See the following image. In this way you can successfully compile your project.

    enter image description here

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