By necessity, mobile screens are small because a mobile phone has to fit into a person's pocket or purse. The small size of mobile screens limits the controls and amount of the content that appear on them. So, there is an obvious change in the user experience between desktop web and mobile web interactions.
The smaller screens on touch devices reduce the context, which makes it difficult for users to find an overview of the page, the various options that are available, and remember prior content on the page. It also causes inaccurate clicks and error-prone typing.
Let's consider a page with a long form having various inputs and buttons. When a user scrolls down the page, the title of the page and previously entered data will disappear from the viewport. Without this information (or context), it is very difficult to get the meaning of the currently visible fields. So in this instance, we can have an overview or the title of...