The width and height are automatically adjusted to make the size cover the entire target area while keeping the aspect ratio. This may extend further out than the target size.
The width and height are automatically adjusted to fit inside the given target area, while keeping the aspect ratio. Depending on the aspect ratio there may be some space inside the area which is not covered.
The width is automatically adjusted based on the height.
No scaling happens at all. The canvas is set to the size given in the game config and Phaser doesn't change it
again from that point on. If you change the canvas size, either via CSS, or directly via code, then you need
to call the Scale Managers
resize method to give the new dimensions, or input events will stop working.
The Canvas is resized to fit all available parent space, regardless of aspect ratio.