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Contexts

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Revision as of 18:51, 5 June 2013 by GPHemsley (talk | contribs) (-s)
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Context types

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

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.