You can easily copy any text on a website and then paste it to anywhere you like on your iPhone or iPad iOS powered device. I will show you on a website to email example.
If you don't have installed program for editing PDF documents on your computer, then you can use web application PDFescape which allows you to edit your documents in your browser.
If you want to put your video files online using HTML5 then it's recommended to have three different formats for a full browser support. Those formats are mp4, ogv and webm.
If you are a Instgram user, then you most probably notices the smilies or so called emoticons people are typing in comments. Let me show you how to use emoticons on your iPhone or iPad.