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RNX code library · 4 controls
RNX-980Field Experience Measurement
Read what these checks mean, why they matter and which evidence they concern. Each ID below keeps its canonical place in the RNX hierarchy.
These are free learning summaries, not full technical tests or an industry certification. Specialized checks apply only to the relevant feature. Experimental labels are preserved from the canonical source.
RNX-980.T001
LCP field assessment
core readiness
For supported real-user data, check whether the main content loads within the stated LCP target: 2.5 seconds at the 75th percentile.
Why it matters. This describes most measured visits, not a promise about every visit.
Illustration — fictional. Real-user measurements show the main content taking 4.5 seconds at the 75th percentile, above this control's target.
When it applies. Inspected target: field metric. Use this check only when that object or feature exists in the review scope; provider-specific checks require that provider's integration. Missing evidence remains unknown.
RNX-980.T002
INP field assessment
core readiness
For supported real-user data, check response to interaction against the INP target: 200 milliseconds at the 75th percentile.
Why it matters. Slow reactions can make a working page feel broken.
Illustration — fictional. Real-user measurements show a 600-millisecond interaction delay at the 75th percentile, above this control's target.
When it applies. Inspected target: field metric. Use this check only when that object or feature exists in the review scope; provider-specific checks require that provider's integration. Missing evidence remains unknown.
RNX-980.T003
CLS field assessment
core readiness
For supported real-user data, check unexpected layout movement against the CLS target: 0.1 at the 75th percentile.
Why it matters. Jumping content can make people lose their place or tap the wrong control.
Illustration — fictional. The measured layout-movement score is 0.3 at the 75th percentile, above this control's target.
When it applies. Inspected target: field metric. Use this check only when that object or feature exists in the review scope; provider-specific checks require that provider's integration. Missing evidence remains unknown.
RNX-980.T004
Field versus lab separation
core readiness
Label a simulated speed test separately from measurements of real visitors.
Why it matters. One laboratory run does not describe everyone's experience.
Illustration — fictional. One simulated speed test is presented as the experience of real visitors.
When it applies. Inspected target: performance report. Use this check only when that object or feature exists in the review scope; provider-specific checks require that provider's integration. Missing evidence remains unknown.