autofocus bug

The question mark will be unable to show the help information element, given a few criteria:

• An input element with the autofocus attribute.
• Two sibling elements to the one with the autofocus attribute: one visible which will, when clicked, display the other element.
• The CSS code has to be included via a link element - if it's within the web page in a style element, all will work fine.
• The page will work the first time it's loaded, but will fail after a soft reload.