height of <div> tag
I have 2 divs in my page: `<div id="firtdiv" style="top:100px; left:200px; height:unknown"></div> <div style="top:unknow; height:200px" id="seconddiv"></div>`

I will set firstdiv's height auto because I will put a datalist so I don't know it's height.
And secondiv's top property will change according to the fistdiv's height. Second div is bottom of firstdiv.

How can I do?
height of <div> tag
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I have 2 divs in my page: `<div id="firtdiv" style="top:100px; left:200px; height:unknown"></div> <div style="top:unknow; height:200px" id="seconddiv"></div>`

I will set firstdiv's height auto because I will put a datalist so I don't know it's height.
And secondiv's top property will change according to the fistdiv's height. Second div is bottom of firstdiv.

How can I do?