Which rule sets the background color of all hyperlinks to green?

Rationale

.a { background-color:green }

This CSS rule targets all HTML elements with the class "a" and sets their background color to green. By utilizing a class selector, it effectively applies the specified style to any element assigned the class, ensuring a uniform background color across multiple hyperlinks.

A (.a { background-color:green }) CORRECT

This is the correct choice as it uses a class selector to apply the green background color to all elements that have the class "a." Since hyperlinks can be assigned classes, this rule will effectively change the background color of such elements when the class is applied.

B (#a { background-color:green }) YOUR ANSWER

This choice employs an ID selector, which targets a specific element with the ID "a." However, IDs are unique to a single element on a page, meaning this rule would only affect one hyperlink rather than all hyperlinks, making it an incorrect choice for setting a general background color for all.

C (a { background-color:green }) YOUR ANSWER

While this rule correctly selects all anchor elements (hyperlinks), it sets only the text color rather than targeting specific classes or IDs. The question asks for a rule that sets the background color, and not specifying a class or ID means this rule will not apply to elements with class "a."

D ([a] { background-color:green }) YOUR ANSWER

This option incorrectly uses an attribute selector. It does not apply to hyperlinks directly, as it looks for elements with an attribute named "a," which is not a standard HTML attribute for hyperlinks. Therefore, it will not achieve the intended effect of changing the background color of hyperlinks.

Conclusion

The CSS class selector .a { background-color:green } is the appropriate rule for setting the background color of all hyperlinks assigned the class "a." In contrast, the other options either target specific elements or misapply selectors, failing to meet the requirement of affecting all hyperlinks uniformly. Understanding the distinctions between class, ID, and element selectors is essential for effective CSS styling.

Which rule sets the background color of all hyperlinks to green?

.a { background-color:green }

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