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The JavaScript Interview Handbook: 100+ Interview Questions

Solution Review: DOM

Explore solutions to common JavaScript DOM interview questions focused on feature detection, the difference between HTML attributes and DOM properties, and property value behavior. Understand these fundamentals to improve your confidence in JavaScript interviews and master browser environment handling.

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Question 1: Solution review #

Explanation #

Feature detection and feature inference are both techniques used to determine if a web technology exists in the browser the user is navigating.

Feature detection determines if a feature exists in a specific browser or not. These can be HTML features or JavaScript methods. From this definition, we know that one of the Options B & D could be correct.

Feature inference assumes that if a feature is available in one browser, it is available in all other browsers as well. From this definition, we can conclude that Option B is the correct answer.

In both Options C & D, the following definition is used: accesses information of the browser environment you are using. This applies neither to feature detection nor feature inference ...