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 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 NaN or ±Infinity).
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
y |
61 | 79 | 31 | No | 48 | 10.1 | 61 | 61 | 31 | 45 | 10.3 | 8.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/DOMPointReadOnly/y