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It's from the default AppTheme.
If no SkinID is defined, then you get a class="episize240", if a SkinID is defined, then you get something else.. :)
You can find the definitions here: C:\Program Files (x86)\EPiServer\CMS\choosen-version\Application\App_Themes\Default
I'm writing an edtior plugin for CMS 5, and I'm having a strange problem. All controls get a class="episize240" in the output source when the plugin is rendered. I've searched for this in the EPiServer code, but I cannot find where it is added. Can anyone help and point me in the right direction? It's driving our front-end-developer mad :)