Holiday Shapes

A server component: the holidays arrive in the holidays dictionary, the moved working days in the workdays array, there is no state. The main technique is encoding by the type of shape rather than by colour alone: a weekend gets the cell filled, a holiday a diamond drawn with a pseudo-element rotated by forty-five degrees, a moved day a dashed border. The number inside the diamond stays upright, because it is the pseudo-element that is rotated, not the cell: rotating the cell would lay the digit on its side. Such a month reads the same under colour blindness and in black-and-white print. Below the grid stand a legend using the same shapes and a list of holidays with their names — a shape without a caption still does not explain what kind of day it is.