Blink aborts computing styles on descendants of display:none nodes. If the inside of the iframe has <body style="display:none">, you make remove recalc style, no layout, no painting. <iframe style="display:none"> still does all that work because it's another document and the display:none effect does not transcend into the other document.
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August 29, 2015 14:07
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Which is faster? <iframe style="display:none"> or <iframe><body style="display:none"></iframe>?
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I don't get how these are related, they are completely two different things. If you hide the iFrame, you are obviously triggering a recalc of the parent document and elements around it, while the body of the document in the iFrame is separate and only that would be affected (fingers crossed). This is more of a question of what happens when the parent element has a set width and height and you want to hide the contents inside.