"\9" randomly pops up everywhere in .css file on debug

Question

Occasionally when I open up Firefox in an ASP.NET MVC 4 project, I get warnings like:

Validation (CSS 3.0): "\9" is not a valid value for the "width" property.

When this happens, "\9" is inserted into the .css file in totally random places. For instance,

.carousel-inner > .item > a > img {  
   display: block;  
   width: 100% \9;  
   max-width: 100%;  
   height: auto;  
}

This forces me to manually delete all instances of "\9" from the .css file. What's going on?

http://stackoverflow.com/questions/8004765/css-9-in-width-property — Dave, Jul 10 '14 at 15:58

score 1 · Accepted Answer · answered Jul 10 '14 at 16:00

1

\9 is a "CSS hack" specific to Internet Explorer 7, 8, & 9.

answered Jul 10 '14 at 16:00

Kaushik

1 Answers1