See these:
https://developer.mozilla.org/En/HTML/Element/Video

https://developer.mozilla.org/en/Using_HTML5_audio_and_video

That WEBM file is send as text/plain by the server: Content-Type: text/plain

• http://andrebenvenuti.info/videos/No1.webm

You need to configure the server to send the file with a supported MIME type.

• https://developer.mozilla.org/En/Media_formats_supported_by_the_audio_and_video_elements

• https://developer.mozilla.org/en/Configuring_servers_for_Ogg_media

.htaccess:

AddType audio/ogg oga ogg
AddType video/ogg ogv

data:text/html,<object type="video/ogg" data="http://andrebenvenuti.info/videos/No1.webm" width="100%" height="100%"></object>

Thanks for the advice. I contacted my service provider (Hostgator) and asked them to help me edit the .htaccess file (my business account does not allow me admin access) first they said FF does not support html5 - I countered this politely! Next they said that the file could (would?) not be modified as it is shared hosting. I replied that I thought it curious that they did not want their shared hosting clients to read html5 video, and that is where we are at the moment. I will push them a little harder.

Did you give them links to the articles that explains this issue?

• https://developer.mozilla.org/en/docs/Properly_Configuring_Server_MIME_Types
• http://wiki.xiph.org/MIME_Types_and_File_Extensions

Post scipt: after spending quite a lot of time being politely fobbed off by hostgator, suddenly the files started to work today and the site plays a .webm file from the video tag! All's well that ends well - I suppose my grumbling eventually reached someone with initiative/power! Thanks for your assistance in any case. One day I hope to be able to contribute in some way - just haven't found the subject yet.

Yes the file in now send as Content-Type: video/webm

• http://andrebenvenuti.info/videos/No1.webm