21. Which font format is not supported by Firefox?
22. Which element creates a grouping of options?
23. Bootstrap was first introduced in . . . . . . . .
24. Which of the following element is for holding client-side content?
25. Which attribute is used to input to prevent user input?
26. Action box does not contains . . . . . . . .
27. Which element works as a sidebar?
28. What should be the set value of the background-size property such that image will fit in the content area?
29. Which element represents a ruby annotation?
30. Which element is a placeholder inside web component?
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