21. Which element is called bidirectional isolation?
22. Which of the following defines a visible heading for <details> element?
23. Which element is used for defining a new custom DOM elements?
24. What appends the popover to specific elements?
25. Which class is a container for progress bars?
26. Which is used on a <ul> container?
27. Which of the following removes left, top and right borders from navbar?
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