Direct answer
HTML separates structure from presentation. Comments, attributes, metadata, and non-rendered nodes may exist in the document even when users do not see them. CSS can additionally hide, clip, move, or visually blend text.
Source view versus rendered view
Raw source contains markup and comments. The DOM represents parsed structure. Rendered text reflects layout and CSS. Accessibility representations may expose labels that are not ordinary body text. These views are related but not identical.
Why this matters
Search engines, screen readers, browser automation, scrapers, and AI ingestion systems can consume different representations. Defensive systems therefore benefit from provenance-aware extraction instead of flattening every string into one undifferentiated text block.
FugitiveAI challenges
The HTML challenges demonstrate comments, data attributes, CSS-hidden text, stylesheet source, and document-head metadata without executing arbitrary user-supplied code.
Frequently asked questions
Is display:none text still in the DOM?
Usually yes, although it is omitted from normal rendering and may be omitted by rendered-text extraction.
Can CSS hide text without removing it?
Yes. Matching colors, opacity, clipping, off-screen positioning, and other techniques can affect visibility while preserving structure.