It appears that HTML5 does not fully support relative height for iframes. I encountered an issue when trying to set the height of my content using the CSS rule:
#content{width:100%; height:100%; border:1px solid;}
In Firefox, this setting was being ignored unless a doctype was included in the document. However, after further investigation, I discovered that I also needed to specify the size of the html element for it to work correctly.
To improve the iframe's layout, consider setting its position to absolute:
#content{
position: absolute;
width: 100%;
height: 100%;
border: 1px solid;
}
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