A user account is required in order to edit this wiki, but we've had to disable public user registrations due to spam.

To request an account, ask an autoconfirmed user on Chat (such as one of these permanent autoconfirmed members).

Sanitization rules: Difference between revisions

From WHATWG Wiki
Jump to navigation Jump to search
No edit summary
Line 568: Line 568:


==== Safe data URL content types ====
==== Safe data URL content types ====
 
Note: This section is being [http://wiki.whatwg.org/wiki/Talk:Sanitization_rules discussed].
* text/plain
* text/plain
* image/gif
* image/gif
* image/jpg
* image/jpg
* image/png
* image/png

Revision as of 20:28, 10 August 2007

This page was initially seeded with the sanitization lists and rules implemented by the html5lib sanitizer, which in turn was based on Jacques Distler's branch of Instiki, which in turn was based on the sanitization logic in the Universal Feed Parser.

It is hoped that others will add, update, and extend this list based on their experiences in their own products, and furthermore that some will update their products based on these lists.

As a suggestion but not as a requirement: people who do update their products to reflect information from this list are encouraged to add a link to this page as a comment in the hopes that it will encourage subsequent maintainers to keep this page up to date.

Acceptable Elements

  • a
  • abbr
  • acronym
  • address
  • area
  • b
  • big
  • blockquote
  • br
  • button
  • caption
  • center
  • cite
  • code
  • col
  • colgroup
  • dd
  • del
  • dfn
  • dir
  • div
  • dl
  • dt
  • em
  • fieldset
  • font
  • form
  • h1
  • h2
  • h3
  • h4
  • h5
  • h6
  • hr
  • i
  • img
  • input
  • ins
  • kbd
  • label
  • legend
  • li
  • map
  • menu
  • ol
  • optgroup
  • option
  • p
  • pre
  • q
  • s
  • samp
  • select
  • small
  • span
  • strike
  • strong
  • sub
  • sup
  • table
  • tbody
  • td
  • textarea
  • tfoot
  • th
  • thead
  • tr
  • tt
  • u
  • ul
  • var

mathml Elements

  • maction
  • math
  • merror
  • mfrac
  • mi
  • mmultiscripts
  • mn
  • mo
  • mover
  • mpadded
  • mphantom
  • mprescripts
  • mroot
  • mrow
  • mspace
  • msqrt
  • mstyle
  • msub
  • msubsup
  • msup
  • mtable
  • mtd
  • mtext
  • mtr
  • munder
  • munderover
  • none

svg Elements

  • a
  • animate
  • animateColor
  • animateMotion
  • animateTransform
  • circle
  • defs
  • desc
  • ellipse
  • font-face
  • font-face-name
  • font-face-src
  • g
  • glyph
  • hkern
  • image
  • linearGradient
  • line
  • marker
  • metadata
  • missing-glyph
  • mpath
  • path
  • polygon
  • polyline
  • radialGradient
  • rect
  • set
  • stop
  • svg
  • switch
  • text
  • title
  • tspan
  • use

Acceptable Attributes

  • abbr
  • accept
  • accept-charset
  • accesskey
  • action
  • align
  • alt
  • axis
  • border
  • cellpadding
  • cellspacing
  • char
  • charoff
  • charset
  • checked
  • cite
  • class
  • clear
  • cols
  • colspan
  • color
  • compact
  • coords
  • datetime
  • dir
  • disabled
  • enctype
  • for
  • frame
  • headers
  • height
  • href
  • hreflang
  • hspace
  • id
  • ismap
  • label
  • lang
  • longdesc
  • maxlength
  • media
  • method
  • multiple
  • name
  • nohref
  • noshade
  • nowrap
  • prompt
  • readonly
  • rel
  • rev
  • rows
  • rowspan
  • rules
  • scope
  • selected
  • shape
  • size
  • span
  • src
  • start
  • style
  • summary
  • tabindex
  • target
  • title
  • type
  • usemap
  • valign
  • value
  • vspace
  • width
  • xml:lang

mathml Attributes

  • actiontype
  • align
  • columnalign
  • columnalign
  • columnalign
  • columnlines
  • columnspacing
  • columnspan
  • depth
  • display
  • displaystyle
  • equalcolumns
  • equalrows
  • fence
  • fontstyle
  • fontweight
  • frame
  • height
  • linethickness
  • lspace
  • mathbackground
  • mathcolor
  • mathvariant
  • mathvariant
  • maxsize
  • minsize
  • other
  • rowalign
  • rowalign
  • rowalign
  • rowlines
  • rowspacing
  • rowspan
  • rspace
  • scriptlevel
  • selection
  • separator
  • stretchy
  • width
  • width
  • xlink:href
  • xlink:show
  • xlink:type
  • xmlns
  • xmlns:xlink

svg Attributes

  • accent-height
  • accumulate
  • additive
  • alphabetic
  • arabic-form
  • ascent
  • attributeName
  • attributeType
  • baseProfile
  • bbox
  • begin
  • by
  • calcMode
  • cap-height
  • class
  • color
  • color-rendering
  • content
  • cx
  • cy
  • d
  • dx
  • dy
  • descent
  • display
  • dur
  • end
  • fill
  • fill-rule
  • font-family
  • font-size
  • font-stretch
  • font-style
  • font-variant
  • font-weight
  • from
  • fx
  • fy
  • g1
  • g2
  • glyph-name
  • gradientUnits
  • hanging
  • height
  • horiz-adv-x
  • horiz-origin-x
  • id
  • ideographic
  • k
  • keyPoints
  • keySplines
  • keyTimes
  • lang
  • marker-end
  • marker-mid
  • marker-start
  • markerHeight
  • markerUnits
  • markerWidth
  • mathematical
  • max
  • min
  • name
  • offset
  • opacity
  • orient
  • origin
  • overline-position
  • overline-thickness
  • panose-1
  • path
  • pathLength
  • points
  • preserveAspectRatio
  • r
  • refX
  • refY
  • repeatCount
  • repeatDur
  • requiredExtensions
  • requiredFeatures
  • restart
  • rotate
  • rx
  • ry
  • slope
  • stemh
  • stemv
  • stop-color
  • stop-opacity
  • strikethrough-position
  • strikethrough-thickness
  • stroke
  • stroke-dasharray
  • stroke-dashoffset
  • stroke-linecap
  • stroke-linejoin
  • stroke-miterlimit
  • stroke-opacity
  • stroke-width
  • systemLanguage
  • target
  • text-anchor
  • to
  • transform
  • type
  • u1
  • u2
  • underline-position
  • underline-thickness
  • unicode
  • unicode-range
  • units-per-em
  • values
  • version
  • viewBox
  • visibility
  • width
  • widths
  • x
  • x-height
  • x1
  • x2
  • xlink:actuate
  • xlink:arcrole
  • xlink:href
  • xlink:role
  • xlink:show
  • xlink:title
  • xlink:type
  • xml:base
  • xml:lang
  • xml:space
  • xmlns
  • xmlns:xlink
  • y
  • y1
  • y2
  • zoomAndPan

CSS Rules

First urls matching the following regular expression are removed:

url\s*\(\s*[^\s)]+?\s*\)\s*

The style strings that don't match the following are deemed obfuscated, and ignored entirely:

^([:,;#%.\sa-zA-Z0-9!]|\w-\w|'[\s\w]+'|"[\s\w]+"|\([\d,\s]+\))*$
^(\s*[-\w]+\s*:\s*[^:;]*(;|$))*$

style Properties

  • azimuth
  • background-color
  • border-bottom-color
  • border-collapse
  • border-color
  • border-left-color
  • border-right-color
  • border-top-color
  • clear
  • color
  • cursor
  • direction
  • display
  • elevation
  • float
  • font
  • font-family
  • font-size
  • font-style
  • font-variant
  • font-weight
  • height
  • letter-spacing
  • line-height
  • overflow
  • pause
  • pause-after
  • pause-before
  • pitch
  • pitch-range
  • richness
  • speak
  • speak-header
  • speak-numeral
  • speak-punctuation
  • speech-rate
  • stress
  • text-align
  • text-decoration
  • text-indent
  • unicode-bidi
  • vertical-align
  • voice-family
  • volume
  • white-space
  • width

style Property Values

  • auto
  • aqua
  • black
  • block
  • blue
  • bold
  • both
  • bottom
  • brown
  • center
  • collapse
  • dashed
  • dotted
  • fuchsia
  • gray
  • green
  • !important
  • italic
  • left
  • lime
  • maroon
  • medium
  • none
  • navy
  • normal
  • nowrap
  • olive
  • pointer
  • purple
  • red
  • right
  • solid
  • silver
  • teal
  • top
  • transparent
  • underline
  • white
  • yellow

In addition, values that match the following regular expression are valid:

^(#[0-9a-f]+|rgb\(\d+%?,\d*%?,?\d*%?\)?|\d{0,2}\.?\d{0,2}(cm|em|ex|in|mm|pc|pt|px|%|,|\))?)$

svg sytle Properties

  • fill
  • fill-opacity
  • fill-rule
  • stroke
  • stroke-width
  • stroke-linecap
  • stroke-linejoin
  • stroke-opacity

URIs

Attributes whose value is a URI

  • href
  • src
  • cite
  • action
  • longdesc
  • xlink:href
  • xml:base

URI protocols

  • afs
  • aim
  • callto
  • data (see below)
  • ed2k
  • feed
  • ftp
  • gopher
  • http
  • https
  • irc
  • mailto
  • news
  • nntp
  • rsync
  • rtsp
  • sftp
  • ssh
  • tag
  • tel
  • telnet
  • urn
  • webcal
  • wtai
  • xmpp

Safe data URL content types

Note: This section is being discussed.

  • text/plain
  • image/gif
  • image/jpg
  • image/png