How can I download videos straight from safari ??

Hello, I am using ipad with the latest ios version i.e., ios 10.0.2.

Please help me out how to download videos(any files mainly documents) straight from safari to view offline.

Many web sites are offering their videos to download videos or may be the other files even thogh the device have space we are not able to utilize that space as a media storage while all the other mobile platforms are providing.

Many users need to show some documents to the other people where the internet may not be available.

This thing mostly happens with the iphones even though they have the outstanding performance and 256 GB of data and if we need those documents offline we have to download some other applications such that we can transfer the documents from a mac or pc(through itunes). We know the devices support these type of documents but we need a way to access the files, documents,videos, etc., we need to depend on a mac or pc(through itunes) we need the devices independent of any other devices.

Is there a way to do so please help me out. So that it is easily accessible.