Validation is used to check data to make sure it fits whatever required specifications are set for it. Typically Validation is used in checking input data, and in verifying data before storage.

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W3C validation error: aria-controls attribute must point to an element in the same document

I'm running my website through the W3C Markup validator and I'm getting the following error: The aria-controls attribute must point to an element in the same document. …"ui-accordion-1-header-2" ...