Lines have the following attributes:
- x1: starting x position
- y1: starting y position
- x2: ending x position
- y2: ending y position
Here are two examples:
<!--the first element won't be visible because it doesn't have a strokethe second will be visible because it does have a stroke--><line x1="0" y1="0" x2="100" y2="100"/><line x1="0" y1="0" x2="100" y2="100" stroke="purple"/>
The following output will be displayed: