The DOMPoint interface's x property holds the horizontal coordinate, x, for a point in space.
In general, positive values x mean to the right, and negative values of x means to the left, barring any transforms that may have altered the orientation of the axes.
A double-precision floating-point value indicating the x coordinate's value for the point. This value is unrestricted, meaning that it is allowed to be infinite or invalid (that is, its value may be NaN or ±Infinity).
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https://developer.mozilla.org/en-US/docs/Web/API/DOMPoint/x