<div><iframe style="height: 100px"></iframe></div>
<div style="line-height: 0"><iframe style="height: 100px"></iframe></div>
Click here to view the code snippet on jsFiddle.
Upon inspecting the DOM, it is evident that the first div has a height of 108px while the second one's height is 104px. Despite the iframe with borders being 104px, it inexplicably adds 4 extra pixels when line-height is set.
This behavior was observed and tested on Chrome version 28.0.1500.71 for Mac OS.
Because the iframes are positioned on the baseline. However, the div must be sufficiently tall to encompass the strut, which extends beyond the baseline and is determined by the line-height.
When the line-height is 0, the strut height is also 0, resulting in no part of the strut extending below the baseline.
To prevent this issue, you can use iframe { display:block; } or iframe { vertical-align:top; } or
iframe { vertical-align:bottom; }(Using display:block prevents the creation of a line box, eliminating the strut. Setting vertical-align to top or bottom allows the strut to move away from the iframe's baseline, ensuring that none of it extends below the iframe. It is important to note that if the line-height exceeds the height of the iframe, the strut will dictate the line-box height and therefore the div height will remain greater than the iframe height, regardless of the vertical-align setting.)
It appears that both divs are 109 pixels tall when viewed in Chrome version 28. It's important to note that the default vertical-align setting for an <iframe> element and all inline elements is baseline. Modifying this setting to bottom will result in both elements aligning as you might have anticipated.
The optimal height can vary depending on the web browser you are using. In my testing, both Firefox and Chrome display IFRAME elements with a height of 104px (100px content height + 4px border).
Which specific browser are you currently using? Have you attempted adding the attribute border="0" to see if that alters the display?
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