​To center an element vertically within its parent element, display the parent element as a table cell with a defined height and then set the vertical-align property to _____.

​A general rule for printing is to use _____ fonts for headlines and serif fonts for body text.

A(n) _____ is any group of characters enclosed within either double or single quotation marks in JavaScript.

​To add notes or comments, insert a comment tag using the syntax _____.

​Which of the following determines the current size of an array?

​When the footer is the last element in a page body, the _____ pseudo-element is used to add a placeholder element after the footer.

Identify the media query that applies style rules only to screens that are at least 300 pixels wide.​

​The cue attribute/setting  _____ places a cue vertically within the video window, where value ranges from 0% (top) to 100% (bottom).

Identify the element that can organize selection list options by placing them in option groups in long selection lists.​

HTML supports the _____ attributes to set the text area size.​