Fix inaccurate wording about cubic-bezier validity #42613
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Removes an overly strong “if and only if” claim that is not supported by the CSS specification.
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| Not all cubic Bézier curves are suitable as easing functions because not all are [mathematical functions](https://en.wikipedia.org/wiki/Function_%28mathematics%29); i.e., curves that for a given x-axis coordinate have zero or one value. With P0 and P3 fixed as defined by CSS, a cubic Bézier curve is a function, and is therefore valid, if and only if the x-axis coordinates of P1 and P2 are both in the `[0, 1]` range. | ||
| Not all cubic Bézier curves are suitable as easing functions because not all are [mathematical functions](https://en.wikipedia.org/wiki/Function_%28mathematics%29); i.e., curves that for a given x-axis coordinate have zero or one value. With P0 and P3 fixed as defined by CSS, a cubic Bézier curve is a function, and is therefore generally valid when the x-axis coordinates of P1 and P2 are both in the [0, 1] range. | ||
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This PR removes an overly strong “if and only if” claim in the cubic-bezier documentation.
The CSS specification does not guarantee this condition, so the wording has been softened to avoid a mathematically incorrect statement.
#42526