findable property
Whether the browser's own find (Ctrl+F, "Find in page") reaches this page on the web. True by default: the shell keeps a findable copy of the page's rendered text in the document and scrolls to what the browser matched, with nothing for the page to add.
False keeps that copy out of the document at runtime, for a page whose text should never be anywhere but its canvas. What the build wrote for crawlers and printers is left, and not searched.
Implementation
final bool findable;