What allows you to set up a web page wherein objects change (appear, disappear, move, morph).

You can set up a web page where objects change where they, appear, disappear, move, morph using TIMELINE.

Explanation:

A timeline is presentation of a sequence of events along a drawn line that enables the reader to quickly understand relationships relating to or limited by time. A website project timeline should list the most important milestones that represent the major stages of creating the website.A timeline can also be used in a web page to change objects within. Morphing involves automatically matching the basic look and feel of a website to cognitive styles. Each stage should be given a set length of time that corresponds to its size and complexity. There is a set of objectives that need to be accomplished in order to complete each stage which help the web page become a reality.Effects can make an object appear, disappear, morph or move. They can change an object's size or color

According to my brain it's a rational number because it can be put as a fraction