ASP.net 4 Style Sheet 'filter' is not a known CSS property

In my ASP.net Web application I get the warning 'filter' is not a known CSS property
on my style sheet with the following code. Not sure what to do.
Thanks


body {
}
.Panel1_Gradient
{
       filter:progid:DXImageTransform.Microsoft.Gradient
       (GradientType=1, StartColorStr='#FF0000', EndColorStr='#FFB6F1')
}
 
.Panel2_Gradient
{
       filter:progid:DXImageTransform.Microsoft.Gradient
       (GradientType=0, StartColorStr='#F0F0F0', EndColorStr='#000000')
}
Murray BrownMicrosoft Cloud Azure/Excel Solution DeveloperAsked:
Who is Participating?
 
BuggyCoderConnect With a Mentor Commented:
filter: is a custom property, not supported by any other browser than IE. That's probably why Visual Studio said it's not recognized, as it's not a valid property according to the W3C.

Reference:
http://social.msdn.microsoft.com/Forums/en-US/wlcontrolsdev/thread/e7988b02-614c-4052-b695-8ef6d563e524/
0
 
Murray BrownMicrosoft Cloud Azure/Excel Solution DeveloperAuthor Commented:
Thanks
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