CRO Glossary
Above-the-Fold Video Autoplay Test
A CRO experiment comparing a static hero visual against an autoplaying video in the top viewport to measure impact on engagement and conversion.
This test isolates one variable — whether a video autoplays in the hero section — to see how it affects visitor behavior versus a static image or muted background. Video can communicate product value faster than text or images, but autoplay also introduces risks: slower load times, unwanted sound, distraction from the CTA, and accessibility concerns for users on mobile data plans.
Practitioners run this test because intuition alone can't predict the outcome — video sometimes lifts engagement and time-on-page but drags down conversion because it competes with the call-to-action for attention, or because autoplay creates a jarring first impression. Conversely, a well-produced product demo can clarify value proposition instantly and reduce bounce rate. The only way to know is to measure it against real traffic with a proper control group.
Antml:example: an e-commerce brand tests a homepage hero with an autoplaying 10-second product video (muted, with captions) against its current static lifestyle photo. They track click-through rate on the primary CTA, bounce rate, and page load time as a guardrail metric, since video weight can slow rendering and hurt above-the-fold performance on mobile connections. If the video variant improves CTA clicks without meaningfully increasing load time or bounce, it becomes the new champion in a champion-challenger rollout.
Related terms
Above vs Below Median Split
A segmentation technique that divides users into two groups at the median of a metric to compare high and low engagers.
Qualitative Feedback Loop
A recurring process of collecting and acting on user comments, session recordings, and survey responses to inform test hypotheses.
Experiment Metadata
The structured record of who, what, when, and how for a test — hypothesis, owner, dates, variants, and metrics used to track and audit it.
Pre-Test Analysis
The upfront work of validating traffic, metrics, and baseline data quality before launching an experiment.
Above-the-Fold vs Below-the-Fold Messaging Hierarchy
How the order and prominence of value-proposition messaging is split between the visible screen and the rest of the page.
Experiment Contamination
When a control or variant group is unintentionally exposed to the other condition, corrupting the comparison.
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