jQuery: showとhideの正体

learn.jquery.com

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// Instantaneously hide all paragraphs $( "p" ).hide();   // Instantaneously show all divs that have the hidden style class $( "div.hidden" ).show();

When jQuery hides an element, it sets its CSS display property to none. This means the content will have zero width and height; it does not mean that the content will simply become transparent and leave an empty area on the page.

まじかよ！

hide()⇔widthとheightが0

なんだってさ。知らんかった。ドキュメントって面白いねぇ。