Trying to understand this HTML statement

[Wilson Mui]

I'm a newbie to html and javascripts, so i was wondering what a statement like the following means.
<ul class="arrow" dynamicoutline>
where dynamicoutline is a javascript function
so I know the <ul> part is for listing, class="arrow" is for .css puroposes (probably), but what about that dynamicoutline part?

[Bear Bibeault]

The dynamicoutline portion of the markup is invalid and will be ignored.

[Wilson Mui]

Is it possible that statement was something Frontpage specific? The page was written, dare I say, in Frontpage. It wasn't me, I swear.

[Eric Pascarello]

What it can be is an attribute that a script reads. For example: I set attributes in my validate script that tells the program what rules to follow.