There seems to be no reliable support data for speak , but it does not seem to be implemented.
Regardless of the implementation status, speak: none not equivalent to aria-hidden="true" .
According to the CR-speech module CR, the speak property determines whether to make text in the aura ", that is, hear.
According to the ARIA specification, aria-hidden "indicates that the element and all its descendants are not visible or perceived by any user as implemented by the author" (italics in the original).
Thus, aria-hidden="true" does not cause anything; he simply states that the author has hidden the element. And this applies to all types of rendering: audible, visible, tactile or any methods that may be invented in the future.
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