Show an analog clock on your WordPress site sidebar or in post and page content.
When IE 8 is manually put or forced (through X-UA-Compatibility meta tag or response header) into Compatibility mode, the Clock will --even though the canvas area is put in place-- remain invisible.
When a shortcode is not placed on its own line but on the same line with text, image or even another shortcode, then the output (div with canvas tag) will be wrapped inside a paragraph tag. While most browsers do not have a problem displaying the clock, this will cause a validation error.
Please report any other issues on the Support page.