Отображать фигуры с помощью SVG
The last challenge created an svg element with a given width and height, which was visible because it had a background-color applied to it in the style tag. The code made space for the given width and height.
The next step is to create a shape to put in the svg area. There are a number of supported shapes in SVG, such as rectangles and circles. They are used to display data. For example, a rectangle (<rect>) SVG shape could create a bar in a bar chart.
When you place a shape into the svg area, you can specify where it goes with x and y coordinates. The origin point of (0, 0) is in the upper-left corner. Positive values for x push the shape to the right, and positive values for y push the shape down from the origin point.
To place a shape in the middle of the 500 (width) x 100 (height) svg from last challenge, the x coordinate would be 250 and the y coordinate would be 50.
An SVG rect has four attributes. There are the x and y coordinates for where it is placed in the svg area. It also has a height and width to specify the size.
Добавьте rect форму в svg используя append() , и присвойте ему атрибут width 25 и атрибут height 100. Также дайте атрибутам rect x и y каждый из которых установлен в 0.