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Client-side testing

Client-side testing changes the page in the visitor browser using JavaScript, typically with a visual editor.

Written by Reflective Data experts · updated Oct 5, 2026

It is quick to set up and needs little engineering, which is why marketers like it. The trade-offs are possible flicker, performance impact and limits on what can be tested.

Good implementations load asynchronously and use anti-flicker techniques carefully.

related

Flash of original content (FOOC)Server-side testingVWO

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We set up, audit and run experimentation programs on any tool. A/B testing services → · Audits

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