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keyTimes

The keyTimes attribute represents a list of time values used to control the pacing of the animation.

Each time in the list corresponds to a value in the values attribute list, and defines when the value is used in the animation. Each time value in the keyTimes list is specified as a floating point value between 0 and 1 (inclusive), representing a proportional offset into the duration of the animation element.

You can use this attribute with the following SVG elements:

Example

<svg viewBox="0 0 120 120" xmlns="http://www.w3.org/2000/svg">
  <circle cx="60" cy="10" r="10">
    <animate
      attributeName="cx"
      dur="4s"
      repeatCount="indefinite"
      values="60; 110; 60; 10; 60"
      keyTimes="0; 0.25; 0.5; 0.75; 1" />
    <animate
      attributeName="cy"
      dur="4s"
      repeatCount="indefinite"
      values="10; 60; 110; 60; 10"
      keyTimes="0; 0.25; 0.5; 0.75; 1" />
  </circle>
</svg>

Usage notes

Value	`<number>` [ `;` `<number>` ]* `;`?
Default value	None
Animatable	No

The value of the keyTimes attribute is a semicolon-separated list of values.

There must be exactly as many values in the keyTimes list as in the values list.

Each successive time value must be greater than or equal to the preceding time value.

The keyTimes list semantics depends upon the interpolation mode:

For linear and spline animation, the first time value in the list must be 0, and the last time value in the list must be 1. The key time associated with each value defines when the value is set; values are interpolated between the key times.
For discrete animation, the first time value in the list must be 0. The time associated with each value defines when the value is set; the animation function uses that value until the next time defined in the list.

If the calcMode attribute is set to paced, the keyTimes attribute is ignored.

If the duration of the animation is indefinite, any keyTimes specification will be ignored.

Safari issue: keyTimes values should be separated with semicolon without space before, f.e: keyTimes="0; 0.25; 0.5; 0.75; 1"

Specifications

Specification
SVG Animations Level 2 # KeyTimesAttribute

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https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/keyTimes