Styling suiteBar and IE8
By Anatoly Mironov
Today I want to share little css tip for styling the suiteBar in SharePoint 2013 and making it work even in IE8. I needed to apply a green color to the suiteBar (#005128). It worked in all browsers except IE8: 
The reason why is a special css rule (in corev15.css) that only IE8 understands: [sourcecode language=“css”] .ms-core-needIEFilter #suiteBarLeft { filter: progid:DXImageTransform.Microsoft.gradient(GradientType=0,startColorstr=#ff0072c6,endColorstr=#ff0072c6); } [/sourcecode] I found this answer in an blog post written by Trace Armstrong: SharePoint 2013 – Branding the Top Bar and the Importance of Browser Testing. You could override this css rule with your colors, just dig into the msdn documentation. What I needed though, was just a plain color, so I didn’t want to dig into that old progid-definitions. There is actually a simpler solution on social.msdn.microsoft.com. A guy called avshinnikov just overrides the “filter” rule by setting it to none. If you apply it only with id selector (#suiteBarLeft) then you have to put “!important” after that. Fortunately I allready had my own css class on html tag which is a sort of a “namespace” for my selectors: [sourcecode language=“css”] .takana-html #suiteBarLeft { background-color: #005128; filter: none; } [/sourcecode] The class .takana-html can have any name, of course, and it can be a class on a closer parent element to the suiteBar. The only goal for that is to make your css rules more important in your design in a natural way (and avoiding the “!important”). Eventhough many people use this principle without thinking about it, I’ve not found any info regarding this principle. I only heard Jeremy Foster and Michael Palermo talking about it and referring to it as “css namespaces” in a video course: Developing in HTML5 with JavaScript and CSS3 Jump Start. Of course, the name isn’t unique, there is another thing called css namespaces. But the concept is really good.
Comments from Wordpress.com
Tip: Use the weakest CSS selectors | Bool Tech - Apr 4, 2014
[…] I would recommend today is to skip the .contoso-html namespace in the CSS but keep it in the masterpage markup, use it wisely, meaning only if the original rule […]