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A single starting point to find the method, source or situation relevant to your question.
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334 results
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JSON-LD
A format expressing machine-readable entities, properties and relationships in a page without replacing visible content.
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Schema.org
A shared vocabulary of types and properties used to describe entities and pages in structured data.
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Rich result
A search presentation that may use a supported structured data type; valid markup does not guarantee display.
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Semantic validation
Checking that values declared in markup agree with facts readers can actually see on the page.
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Regression test
Repeating the same cases after a change to detect a capability or boundary that no longer works.
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Indirect prompt injection
A hostile instruction placed in a source read by an agent, such as a page or document, to redirect its actions.
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Content drift
The gap that develops over time between a page, its sources, other pages and language versions.
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Content consolidation
Combining similar pages into a more useful answer while explicitly handling old URLs and links.
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Accessible name
Text used by assistive technology to identify a control or field; it should match its visible purpose.
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Focus order
The sequence in which keyboard focus moves between interactive elements while preserving the journey’s meaning.
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Contrast ratio
Difference in luminance between text or a component and its background, checked against the relevant criterion.
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TTFB
Time from navigation start to the first response byte, including connection, redirects and server response.
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FCP
Time until the browser first renders visible content such as text or an image; it does not measure the largest element.
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TBT
A lab measure adding up the time long tasks block the main thread between FCP and Time to Interactive.
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Field data
Measurements from real visits, interpreted by period, device population and sample size.
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Server-side validation
Checking received input on the server even when the browser provides immediate validation.
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Alternative text
Text conveying an image’s purpose or information in context without needless repetition.
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Decorative image
A visual with no information needed for the task; its alternative can be empty to avoid noise.
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Source independence
Two observations do not depend on the same collection; repeated accounts of one document remain one origin.
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Circular sourcing
Publications cite or repeat a claim without adding an independent observation.
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Corroboration
Support for a claim from distinct items whose origin, context and independence have been checked.
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Signal timeline
Dated observations separating when an event happened, was published and was discovered.
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Timestamp
Time attached to a trace, whose precision, timezone and source need to be recorded.
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Name collision
Different entities sharing a name; the label alone cannot establish identity.