bad_css

OBSOLETE PREFIXES
    -xv-interpret-as      // -xv- and -o- are old Opera prefixes for the Presto
    -xv-phonemes          // engine. Opera switched to the Blink engine with
    -xv-voice-balance     // version 15. The current version is 23.
    -xv-voice-duration
    -xv-voice-pitch
    -xv-voice-pitch-range
    -xv-voice-rate
    -xv-voice-stress
    -xv-voice-volume
    -o-border-image
    -o-device-pixel-ratio
    -o-focus-opacity
    -o-link
    -o-link-source
    -o-mini-fold
    -o-object-fit
    -o-object-position
    -o-tab-size
    -o-table-baseline
    -o-transform
    -o-transform-origin
    -o-transition
    -o-transition-delay
    -o-transition-duration
    -o-transition-property
    -o-transition-timing-function
    -apple-dashboard-region   // use -webkit- instead of -apple-. non-standard anyway.
    -wap-accesskey            // part of the failed Wireless CSS spec. WCSS was
    -wap-input-format         // a subset of CSS2 with a few extensions. -wap-
    -wap-input-required       // prefixed properties should not be used.
    -wap-marquee-dir
    -wap-marquee-loop
    -wap-marquee-speed
    -wap-marquee-style

OBSOLETE PROPERTIES
    -ms-flex-align            // IE10 supports the old 2012 syntax. IE11 supports
    -ms-flex-item-align       // the modern syntax unprefixed. 
    -ms-flex-line-pack
    -ms-flex-negative
    -ms-flex-order
    -ms-flex-pack
    -ms-flex-positive
    -ms-flex-preferred-size
    clip
    -webkit-mask-source-type  // i think this was renamed to mask-type

NO NEED FOR PREFIX
    -moz-animation            // CSS3 animations were unprefixed in Firefox 15. the
    -moz-animation-delay      // current version is 31
    -moz-animation-direction
    -moz-animation-duration
    -moz-animation-fill-mode
    -moz-animation-iteration-count
    -moz-animation-name
    -moz-animation-play-state
    -moz-animation-timing-function
    -moz-backface-visibility  // unprefixed in Firefox 16
    -moz-border-image         // unprefixed in Firefox 15
    -moz-perspective          // unprefixed in Firefox 16
    -moz-perspective-origin   // unprefixed in Firefox 16
    -moz-transform            // unprefixed in Firefox 16
    -moz-transform-origin     // unprefixed in Firefox 16
    -moz-transform-style      // unprefixed in Firefox 16
    -moz-transition           // unprefixed in Firefox 16
    -moz-transition-delay     // unprefixed in Firefox 16
    -moz-transition-duration  // unprefixed in Firefox 16
    -moz-transition-property  // unprefixed in Firefox 16
    -moz-transition-timing-function  // unprefixed in Firefox 16
    -ms-animation             // unprefixed in IE10. according to caniuse.com, these
    -ms-animation-delay       // animation properties were never prefixed
    -ms-animation-direction
    -ms-animation-duration
    -ms-animation-fill-mode
    -ms-animation-iteration-count
    -ms-animation-name
    -ms-animation-play-state
    -ms-animation-timing-function
    -ms-font-feature-settings  // unprefixed in IE10. according to caniuse.com, this was never prefixed
    -ms-transition             // unprefixed in IE10. according to caniuse.com, these were never prefixed
    -ms-transition-delay
    -ms-transition-duration
    -ms-transition-property
    -ms-transition-timing-function
    -webkit-background-clip
    -webkit-background-origin
    -webkit-background-size
    -webkit-border-bottom-left-radius
    -webkit-border-bottom-right-radius
    -webkit-border-top-left-radius
    -webkit-border-top-right-radius
    -webkit-border-radius
    -webkit-box-sizing
    -webkit-opacity
    -webkit-text-decoration

NOT ON STANDARDS TRACK
    -epub-text-combine            // most of these are listed on MDN as "do not use",
    -webkit-text-combine          // but MDN has lots of errors.
    -webkit-dashboard-region
    -moz-appearance
    -webkit-appearance
    -moz-background-inline-policy
    -moz-binding
    -moz-border-end
    -moz-border-end-color
    -moz-border-end-style
    -moz-border-end-width
    -moz-border-bottom-colors     // border-bottom-color is supported
    -moz-border-left-colors
    -moz-border-right-colors
    -moz-border-top-colors
    -moz-border-start
    -moz-border-start-color
    -moz-border-start-style
    -moz-border-start-width
    -moz-box-align
    -moz-box-direction
    -moz-box-flex
    -moz-box-ordinal-group
    -moz-box-orient
    -moz-box-pack
    -moz-control-character-visibility
    -moz-float-edge
    -moz-force-broken-image-icon
    -moz-image-region
    -moz-margin-end
    -moz-margin-start
    -moz-math-display
    -moz-math-variant
    -moz-orient
    -moz-osx-font-smoothing
    -moz-outline-radius
    -moz-outline-radius-bottomleft
    -moz-outline-radius-bottomright
    -moz-outline-radius-topleft
    -moz-outline-radius-topright
    -moz-padding-end
    -moz-padding-start
    -moz-script-level
    -moz-script-min-size
    -moz-script-size-multiplier
    -moz-stack-sizing
    -moz-user-focus
    -moz-user-input
    -moz-user-modify
    -moz-user-select
    -moz-window-shadow
    -ms-block-progression
    -ms-content-zoom-chaining
    -ms-content-zoom-limit
    -ms-content-zoom-limit-max
    -ms-content-zoom-limit-min
    -ms-content-zoom-snap
    -ms-content-zoom-snap-points
    -ms-content-zoom-snap-type
    -ms-content-zooming
    -ms-grid-columns
    -ms-grid-rows
    -ms-high-contrast-adjust
    -ms-hyphenate-limit-chars
    -ms-hyphenate-limit-lines
    -ms-hyphenate-limit-zone
    -ms-ime-align
    -ms-interpolation-mode
    -ms-scroll-chaining
    -ms-scroll-limit
    -ms-scroll-limit-x-max
    -ms-scroll-limit-x-min
    -ms-scroll-limit-y-max
    -ms-scroll-limit-y-min
    -ms-scroll-rails
    -ms-scroll-snap-points-x
    -ms-scroll-snap-points-y
    -ms-scroll-snap-type
    -ms-scroll-snap-x
    -ms-scroll-snap-y
    -ms-scroll-translation
    -ms-text-combine-horizontal
    -ms-touch-action
    -ms-touch-select
    -ms-user-select
    -ms-wrap-margin
    -webkit-aspect-ratio
    -webkit-background-composite
    -webkit-border-after
    -webkit-border-after-color
    -webkit-border-after-style
    -webkit-border-after-width
    -webkit-border-before
    -webkit-border-before-color
    -webkit-border-before-style
    -webkit-border-before-width
    -webkit-border-end
    -webkit-border-end-color
    -webkit-border-end-style
    -webkit-border-end-width
    -webkit-border-fit
    -webkit-border-horizontal-spacing
    -webkit-border-start
    -webkit-border-start-color
    -webkit-border-start-style
    -webkit-border-start-width
    -webkit-border-vertical-spacing
    -webkit-box-align
    -webkit-box-direction
    -webkit-box-flex
    -webkit-box-flex-group
    -webkit-box-lines
    -webkit-box-ordinal-group
    -webkit-box-orient
    -webkit-box-pack
    -webkit-box-reflect
    -webkit-box-shadow
    -webkit-column-axis
    -webkit-column-break-after
    -webkit-column-break-before
    -webkit-column-break-inside
    -webkit-alt
    -webkit-app-region
    -webkit-column-progression
    -webkit-font-smoothing
    -webkit-highlight
    -webkit-hyphenate-character
    -webkit-line-box-contain
    -webkit-line-break
    -webkit-line-clamp
    -webkit-locale
    -webkit-logical-height
    -webkit-logical-width
    -webkit-margin-after
    -webkit-margin-after-collapse
    -webkit-margin-before
    -webkit-margin-before-collapse
    -webkit-margin-bottom-collapse
    -webkit-margin-collapse
    -webkit-margin-end
    -webkit-margin-start
    -webkit-margin-top-collapse
    -webkit-marquee
    -webkit-marquee-direction
    -webkit-marquee-increment
    -webkit-marquee-repetition
    -webkit-marquee-speed
    -webkit-marquee-style
    -webkit-mask-box-image          // syntax was changed to mask-border-*
    -webkit-mask-box-image-outset
    -webkit-mask-box-image-repeat
    -webkit-mask-box-image-slice
    -webkit-mask-box-image-source
    -webkit-mask-box-image-width
    -webkit-mask-position-x
    -webkit-mask-position-y
    -webkit-mask-repeat-x
    -webkit-mask-repeat-y
    -webkit-max-logical-height
    -webkit-max-logical-width
    -webkit-min-logical-height
    -webkit-min-logical-width
    -webkit-padding-after
    -webkit-padding-before
    -webkit-padding-end
    -webkit-padding-start
    -webkit-perspective-origin-x
    -webkit-perspective-origin-y
    -webkit-print-color-adjust
    -webkit-region-break-after
    -webkit-region-break-before
    -webkit-region-break-inside
    -webkit-rtl-ordering
    -webkit-scroll-snap-coordinate
    -webkit-scroll-snap-destination
    -webkit-scroll-snap-points-x
    -webkit-scroll-snap-points-y
    -webkit-scroll-snap-type
    -webkit-svg-shadow
    -webkit-tap-highlight-color
    -webkit-text-decorations-in-effect
    -webkit-text-fill-color
    -webkit-text-security
    -webkit-text-stroke
    -webkit-text-stroke-color
    -webkit-text-stroke-width
    -webkit-touch-callout
    -webkit-transform-origin-x
    -webkit-transform-origin-y
    -webkit-transform-origin-z
    -webkit-user-drag
    -webkit-user-modify
    -webkit-user-select
    accelerator
    background-blend-mode
    background-repeat-x
    background-repeat-y
    buffered-rendering
    color-rendering
    enable-background
    fill
    fill-opacity
    fill-rule
    glyph-orientation-horizontal
    glyph-orientation-vertical
    kerning
    layout-flow
    layout-grid
    layout-grid-char
    layout-grid-line
    layout-grid-mode
    layout-grid-type
    marker
    marker-end
    marker-mid
    marker-offset
    marker-start
    paint-order
    ruby-overhang
    scrollbar-arrow-color
    scrollbar-base-color
    scrollbar-dark-shadow-color
    scrollbar-face-color
    scrollbar-highlight-color
    scrollbar-shadow-color
    scrollbar-track-color
    scrollbar3d-light-color
    shape-rendering
    stop-color
    stop-opacity
    stroke
    stroke-dasharray
    stroke-dashoffset
    stroke-linecap
    stroke-linejoin
    stroke-miterlimit
    stroke-opacity
    stroke-width
    style-float
    text-anchor
    text-autospace
    text-decoration-blink
    text-decoration-line-through
    text-decoration-none
    text-decoration-overline
    text-decoration-underline
    text-justify-trim
    text-kashida
    text-kashida-space
    text-line-through-color
    text-line-through-mode
    text-line-through-style
    text-line-through-width
    text-overline-color
    text-overline-mode
    text-overline-style
    text-overline-width
    text-rendering
    text-underline-color
    text-underline-mode
    text-underline-style
    text-underline-width
    touch-action
    vector-effect

NOT SURE
    -epub-caption-side       // discussion here: http://lists.w3.org/Archives/Public/www-style/2013Aug/0430.html
    -epub-hyphens            // all these properties are available in unprefixed form
    -epub-text-orientation   // in modern browsers. i have no idea if epub readers
    -epub-text-transform     // actually implement them. honest question: how many
    -epub-word-break         // people are writing CSS targeting epub readers?
    -epub-writing-mode
    -moz-text-size-adjust    // text-size-adjust only implemented in mobile safari,
    -webkit-text-size-adjust // where it's buggy. property is "at risk" in the spec
                             // and the entire spec is at risk. still, i'm taking
                             // it out of illegal and simply not highlighting it
                             // for now