Glossary · Indexing and discovery
duplicate id
Two elements on one page with the same id attribute. Labels, aria-labelledby, aria-describedby and skip links all resolve by id and land on the first match, which is usually the wrong element. Invalid HTML that validators tolerate and screen readers do not.
Terms this definition uses
Indexing and discovery
Whether a page can be found and kept, separately from whether it can be fetched.
index coverage · canonical · noindex · X-Robots-Tag · orphan page · E-E-A-T · E-E-A-T proxies · topical authority · Soft 404 · case consistency · accessibility structure · landmark region · accessible name · skip link · main landmark · alt attribute · form control name · IndexNow · faceted navigation
← form control name · IndexNow →
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