How to detect if field is Blank and then fill (if blank)

[ellnew]

Hi,

I'm using Chromeahk.1.2

So I've been doing some research and there are similar topics such as this, but I couldn't find an example of the specific one as outlined in the subject.

So I'm not really sure where to begin with something like this.

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js= page.Evaluate("document.querySelector('#duration')

The above is what I'm trying to target. Would you need to set that first as a variable? I've seen some code such as

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If var == ""

If so, how would you set the variable?

So to sumarise my IF statement would sound like this
If #Duration = Blank
Then Send the value 3:00
Otherwise, do nothing.