What are void elements in HTML?
Interviewer Expectations for this Question
01
Core Competency
Assesses fundamental understanding of HTML & CSS conventions, runtime behavior, and memory/performance considerations.
02
Evaluation Criteria
Hiring managers look for precision, avoidance of ambiguous jargon, and ability to explain trade-offs under real production conditions.
Comprehensive Model Answer
Verified Solution
Void elements (historically called self-closing or empty elements) are HTML elements that cannot have any child nodes (neither text nor nested elements) and must never have a closing tag (</...>).
### Complete List of HTML5 Void Elements:
<area>: Image map active region<base>: Base URL for relative paths<br>: Line break<col>: Column properties in a table<embed>: External application or plugin container<hr>: Thematic break (horizontal line)<img>: Image element<input>: Form control<link>: Document relationship metadata (e.g. stylesheets)<meta>: Document metadata<param>: Plugin parameter<source>: Media resource for<audio>and<video><track>: Text track for subtitles<wbr>: Word break opportunity
### HTML5 Syntax Note:
In modern HTML5, writing <br> or <br /> is functionally identical; the trailing slash is purely optional and originates from strict XML/XHTML compatibility.
Candidate Response Strategy & Interview Tips
- Start with a concise one-sentence summary: Deliver a direct, confident answer first before expanding into nuances.
- Demonstrate real-world trade-offs: Discuss where this approach excels and when you would avoid it in production systems.
- Discuss complexity & edge cases: Proactively explain time/space complexity or boundary conditions (null values, scale limits).
- Prepare for interviewer follow-ups: Technical hiring panels frequently probe deeper into concurrency, backward compatibility, or alternative libraries.