Pause before CSS property

This attribute specifies the pause to observe before speaking the element's contents. Possible values ​​are

• time - represents the pause in absolute time units (seconds and milliseconds).
• percentage - refers to the reciprocal of the speech-rate attribute value. For example, if the speech rate is 120 words per minute (that is, one word takes half a second or 500 milliseconds), then pause-before of 100% means a pause of 500 milliseconds, and pause-before 20% means 100 milliseconds.

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