Since HTML5 technology is relatively new, it still has issues with cross-browser support. For most browsers, you just need to install the latest version to view HTML5 presentations.
In the case of Internet Explorer, the latest version (IE9) may still have playback issues because of the Compatibility View mode. This mode was developed for displaying websites designed for earlier versions of Internet Explorer. Does IE9 support html5?
To display modern HTML5 websites and presentations correctly in Internet Explorer 9, switch off Compatibility View using one of the ways below:
1. Disable the Compatibility View Icon
In Internet Explorer 9, there is a Compatibility View button on the address bar. If the Compatibility View mode is on, the icon is of a solid color.
When switched off, the icon will turn to an outline.
2. Remove the Website from the Compatibility List
To access the Compatibility View settings, press Alt on the keyboard and click Tools.
Websites can be removed from the compatibility list in the Compatibility View settings. Check whether your website is on the list, and if it is, click Remove.
3. Turn off the Default Compatibility View
In the Compatibility View settings, disable the checkbox “Display all websites in Compatibility View”.
Once you turn off the compatibility mode, your HTML5 presentation will be displayed correctly in your Internet Explorer 9 browser.