This creates a divergence between what a CSS selector means and what a
jQuery selector means. Think about this code:

 <iframe src="http://google.com";>
    <p>This browser doesn't support iframes, or has them disabled.</p>
 </iframe>

This css selector will make the error message bold:

iframe p { font-weight: bold }

With the proposed change, this selector would bold all the p tags in
the google.com page:

$("iframe p").css("font-weight", "bold");

That's too much magic for me. The iframe contents aren't part of the
current document, they're in a document unto themselves.

As for how to make selector syntax more symmetrical with the method
syntax, how about a :contents pseudo?

$("iframe:contents p").addClass("error")  ===  $("iframe").contents
().find("p").addClass("error")

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