Descriptive names versus abbreviations for UI elements

I have been using abbreviations for UI elements for a long time. I think most developers have and still do. When you declare a button which will give the user the possibility to log on, it will be called: btnLogOn (or something similar). At first I wasn’t really thinking this through and automatically started the name of a dropdownlist with ddl, of a label with lbl etc... One day I was programming in Visual Studio, I was creating a trivial user interface, and I typed something like this:

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