accessibility.textLayer
Accessible text layer over each page. Screen readers read pages in reading order (each page is an ARIA region labeled "Page N of M"): the text the viewer is designed to expose for a WCAG 2.1, Section 508 or EN 301 549 review. Native find-in-page matches text on rendered pages; Ctrl/Cmd+F opens the SDK's own Search, which covers the whole document, and the browser's find gets the key when Search is off (tools.search: false) or shortcuts are (navigation.keyboardShortcuts: false). Native selection & copy work with no tool active (defaultTool: null) — drag-select and Ctrl/Cmd+C like regular web text; the selection highlight aligns with the rendered glyphs. Select, the resting tool by default, selects and copies the same text with its own selection.
Set it to false only when the host application provides its own accessible representation of the document.
License. The text layer puts the page's words into the page's markup, where any script on the page can read them, so it is built only under a license that includes extract or whose output is clean (a production license). Under a development key without extract, an unverified or an unlicensed session, the pages are shown without it.