Opera also released a preview build that was showcased the same day , and a manifesto that called for video to become a first - class citizen of the web .
The < video > element was proposed by Opera Software in February 2007 .
Opera Software also released a preview build that was showcased the same day , and a manifesto that called for video to become a first - class citizen of the web .
The < video > element was proposed by Opera Software in February 2007 .