The <noop> task says that nothing should be done (noop stands for "no operation"). This tag is used to override deck-level elements.
The <do> tag can be used to activate the task when the user clicks on a word or phrase on the screen.
The example given bellow below uses a <do> tag to add a "Back" link to the card. When the user clicks on the "Back" link, he or she should be taken back to the previous card. But the tag prevents this operation; when the user clicks on the "Back" link nothing will happen:
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