files/en-us/web/api/dompointreadonly/y/index.md
{{APIRef("Geometry Interfaces")}}{{AvailableInWorkers}}
The DOMPointReadOnly interface's
y property holds the vertical coordinate, y, for a
read-only point in space.
If your script needs to be able to change the value of this property, you should instead use the {{domxref("DOMPoint")}} object.
In general, positive values of y mean downward, and negative values of
y mean upward, assuming no transforms have resulted in a reversal.
A double-precision floating-point value indicating the y 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 {{jsxref("NaN")}} or {{jsxref("Infinity", "±Infinity")}}).
{{Specifications}}
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