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Contexts

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Revision as of 18:22, 5 June 2013 by GPHemsley (talk | contribs) (How to use a context: Add CSP directives to decision-making process.)
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Context types

Context Definition Type Hint Scriptable? Used in HTML? Used in CSS? Sniffing Algorithm CSP Directives
browsing HTML Yes Yes No? MIME type sniffing algorithm connect-src, frame-src
image No Yes Yes rules for sniffing images specifically img-src
audio/video No Yes No? rules for sniffing audio and video specifically media-src
plugin Yes? Yes No? object-src
style @type or "text/css" No Yes Yes? style-src
script @type or "text/javascript" Yes? Yes No? script-src
font format() No No Yes rules for sniffing fonts specifically font-src
text track "text/vtt" No Yes No
cache manifest "text/cache-manifest" No Yes No

How to use a context

  1. Identify context.
  2. Determine whether to fetch resource based on CSP directives and type hint, if any.
  3. Set no-sniff flag on resource, if necessary.
  4. Fetch resource.
  5. Handle resource.
  6. Sniff resource.
  7. Process and display resource or prompt to download resource, as appropriate.