Placeholder text isn't centered with a large line-height. It should be centered to match where the text will actually be entered.
<input placeholder="This is some placeholder text" style="line-height: 40px;">
Put the testcase in the url field
Also affects horizontal text-align.
InChromium issue: http://crbug.com/72413
Fixed by http://trac.webkit.org/changeset/90971