What is the difference between relative, absolute, fixed and sticky positioning?
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
- static: default, follows normal flow.
- relative: stays in flow but offsets from its normal position; also establishes a containing block for absolutely positioned descendants.
- absolute: removed from flow, positioned relative to the nearest positioned ancestor (or the initial containing block).
- fixed: removed from flow, positioned relative to the viewport and unaffected by scrolling.
- sticky: behaves as relative until a threshold is crossed, then sticks within its scrolling ancestor; it needs a top/right/bottom/left value.
Common bug: an absolute child escapes to the viewport because no ancestor has position set. Add position: relative to the intended parent.
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.