Use the block.topElement parameter to query the element number of the first visible element in the block selection. If there is no visible block selection, block.topElement will return zero.
query command
Global.
query block.topElement
query block.topElement
block command
query command
block.anythingSelected parameter
block.bottomElement parameter
block.bottomPosition parameter
block.elementText parameter
block.inView parameter
block.text parameter
block.topPosition parameter
block.type parameter
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