The height property of the DOMRect interface represents the height of the rectangle. The value can be negative.

MDN Reference

The width property of the DOMRect interface represents the width of the rectangle. The value can be negative.

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The x property of the DOMRect interface represents the x-coordinate of the rectangle, which is the horizontal distance between the viewport's left edge and the rectangle's origin.

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The y property of the DOMRect interface represents the y-coordinate of the rectangle, which is the vertical distance between the viewport's top edge and the rectangle's origin.

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The fromRect() static method of the DOMRect object creates a new DOMRect object with a given location and dimensions.

MDN Reference