Question at position 5 Which of the following is a definition of a CSS id?p.id { font-family : Courier new;}.RedLarge { font-size: 20pt; color: red;}h2#BlueHead {font-weight: bold; color: blue;}All of these.

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Question at position 5 Which of the following is a definition of a CSS id?p.id { font-family : Courier new;}.RedLarge { font-size: 20pt; color: red;}h2#BlueHead {font-weight: bold; color: blue;}All of these.

BlackTom AI · Accepted Answer

The question asks: Which of the following is a definition of a CSS id? Then it provides several CSS snippets as options. Option 1: 'p.id { font-family : Courier new;}' This selector targets any

element with the class 'id'. Since it uses a class selector (.) before the name 'id', it is not an id selector, and therefore does not define an id in CSS. The syntax is incorrect for an id, so this is not a definition of an id. Option 2: '.RedLarge { font-size: 20pt; color: red;}' Here, the selector begins with a dot, indicating a class selector for elements with class 'RedLarge'. It does not define or reference an id (which would use a hash '#'), so this is also not an id declaration. Misidentification of the type of selector makes this incorrect. Option 3: 'h2#BlueHead {font-weight: bold; color: blue;}' This uses 'h2' as the element type and '#BlueHead' as the id for that element, composing a valid id selector in combination with an element selector. The syntax correctly defines styling for the element with id='BlueHead', so this is indeed a definition of a CSS id. Option 4: 'All of these.' This would only be true if every preceding option defined an id, but as established, Options 1 and 2 do not define an id. Therefore this option cannot be correct. In summary, option 3 accurately demonstrates an id selector by using '#BlueHead' to target an element with the id 'BlueHead', in combination with the element type 'h2'. The other options either use a class selector ('.id' or '.RedLarge') or incorrectly imply that all snippets define an id. The critical distinction hinges on the use of the hash symbol '#' to declare or reference an id in CSS, versus a dot '.' used for class selectors.

Question at position 5 Which of the following is a definition of a CSS id?p.id { font-family : Courier new;}.RedLarge { font-size: 20pt; color: red;}h2#BlueHead {font-weight: bold; color: blue;}All of these.单项选择题

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