1) Save this as "example1.svg". Change the file so that the blue rectangle is a
bit further in the middle of the page.
2) Add a green circle and a yellow star to the example.
3) Add some text.
Hello, World!
5) Create a form which asks a user for a colour and write a script
that generates an SVG response page which shows a circle in that colour.
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12) ... Change it from a directed to an undirected graph.
- change "digraph" to "graph"
- change "->" to "--"