Hello, I'm making web application for SmartPhone. I want to know How to write HTML5 video tag to play 3gp file on Galaxy S. First, I sent mail with a 3gp file to Galaxy S, and tried to play the attached file. so 3gp file was correctly played. Second, to play 3gp file from default browser on Galaxy S, I wrote HTML5 video tag. Though I succeeded to play 3gp file In case of other Android Phone, 3gp file was not played on Galaxy S. I tried to write HTML5 video tag in any other way , but I failed to play 3gp file. How should I write HTML5 tag to play on Galaxy S? I can't make swf file automatically from 3gp, so I can't use flash player.