Hi,
I'm just a beginner with dreamweaver but when I use it I keep getting a red line under my code for example in the following code:

<link rel="stylesheet" href="emx_nav_left.css" type="text/css">

href="emx_nav_left.css" is underlined in red it has also happened when I have set up a text field for a form but then I have gone back to change the properties and for example have added a size ="15" inside the tag. It doesn't seem to affect my pages but can anyone tell me why thi is please?

Thanks.

That means there is a error and that certain browsers will not work with it. Check the help section and read up on Target Browser Check.