Cascade declared property values instead of applying values on top of each other

Source/core/css/CSSProperties.in

 // FIXME: When we have all the properties using the new StyleBuilder, we
 //   should use this for make_css_property_names.py
 // Note that type_name is currently only used for non-custom value application
 // and when explicitly referred to in generated applicators.
 // Note: Mandatory blank line to skip parameter parsing phase
 
 align-content
 align-items custom_all
 align-self custom_all
 background-attachment custom_all
@@ skipping 64 matching lines @@
 grid-column-start converter=convertGridPosition
 grid-column-end converter=convertGridPosition
 grid-row-start converter=convertGridPosition
 grid-row-end converter=convertGridPosition
 grid-template-columns custom_all
 grid-template-rows custom_all
 grid-template-areas custom_all
 height initial=initialSize, converter=convertLengthSizing
 justify-content
 image-rendering
-internal-callback custom_all
 isolation
 justify-items custom_all
 justify-self custom_all
 left initial=initialOffset, converter=convertLengthOrAuto
 letter-spacing initial=initialLetterWordSpacing, converter=convertSpacing
 line-height getter=specifiedLineHeight, custom_value
 list-style-image custom_value
 list-style-position
 list-style-type
 margin-bottom initial=initialMargin, converter=convertLengthOrAuto
@@ skipping 34 matching lines @@
 scroll-behavior type_name=ScrollBehavior
 shape-image-threshold type_name=float
 shape-margin converter=convertLength
 shape-outside custom_value
 size custom_all
 speak
 table-layout
 tab-size type_name=unsigned
 text-align custom_value
 text-align-last type_name=TextAlignLast
-text-decoration converter=convertFlags<TextDecoration>
-text-decoration-line use_handlers_for=CSSPropertyTextDecoration
+text-decoration-line name_for_methods=TextDecoration, converter=convertFlags<TextDecoration>
 text-decoration-color custom_all
 text-decoration-style type_name=TextDecorationStyle
 text-indent custom_all
 text-justify type_name=TextJustify
 text-overflow type_name=TextOverflow
 text-rendering font, type_name=TextRenderingMode
 text-shadow converter=convertShadow
 text-transform
 top initial=initialOffset, converter=convertLengthOrAuto
 touch-action converter=convertFlags<TouchAction>
 touch-action-delay type_name=TouchActionDelay
 unicode-bidi
 vertical-align custom_inherit, custom_value
 visibility
 white-space
 widows type_name=short, custom_all
 width initial=initialSize, converter=convertLengthSizing
 will-change custom_all
 word-break
 word-spacing initial=initialLetterWordSpacing, converter=convertSpacing
-// UAs must treat 'word-wrap' as an alternate name for the 'overflow-wrap' property. So using the same handlers.
-word-wrap name_for_methods=OverflowWrap
 zoom custom_all
 z-index type_name=int, custom_all
 
 -webkit-animation-delay custom_all
 -webkit-animation-direction custom_all
 -webkit-animation-duration custom_all
 -webkit-animation-fillMode custom_all
 -webkit-animation-iteration-count custom_all
 -webkit-animation-name custom_all
 -webkit-animation-play-state custom_all
 -webkit-animation-timing-function custom_all
 -webkit-app-region custom_all
 -webkit-appearance type_name=ControlPart
 -webkit-aspect-ratio custom_all
 backface-visibility
--webkit-backface-visibility
--webkit-background-clip use_handlers_for=CSSPropertyBackgroundClip
 -webkit-background-composite custom_all
--webkit-background-origin use_handlers_for=CSSPropertyBackgroundOrigin
--webkit-background-size use_handlers_for=CSSPropertyBackgroundSize
 -webkit-border-fit
 -webkit-border-horizontal-spacing name_for_methods=HorizontalBorderSpacing, converter=convertComputedLength<short>
 -webkit-border-image initial=initialNinePieceImage, custom_value
 -webkit-border-vertical-spacing name_for_methods=VerticalBorderSpacing, converter=convertComputedLength<short>
 -webkit-box-align type_name=EBoxAlignment
 -webkit-box-decoration-break
 -webkit-box-direction
 -webkit-box-flex-group type_name=unsigned int
 -webkit-box-flex type_name=float
 -webkit-box-lines
 -webkit-box-ordinal-group type_name=unsigned int
 -webkit-box-orient
 -webkit-box-pack
 -webkit-box-reflect converter=convertBoxReflect
--webkit-box-shadow use_handlers_for=CSSPropertyBoxShadow
 -webkit-clip-path custom_value
 -webkit-column-break-after type_name=EPageBreak, initial=initialPageBreak
 -webkit-column-break-before type_name=EPageBreak, initial=initialPageBreak
 -webkit-column-break-inside type_name=EPageBreak, initial=initialPageBreak
 -webkit-column-count type_name=unsigned short, custom_all
 column-fill type_name=ColumnFill
 -webkit-column-gap type_name=float, custom_all
 -webkit-column-rule-color custom_all
 -webkit-column-rule-style type_name=EBorderStyle, initial=initialBorderStyle
 -webkit-column-rule-width converter=convertLineWidth<unsigned short>
@@ skipping 24 matching lines @@
 -webkit-mask-box-image-width custom_all
 -webkit-mask-clip custom_all
 -webkit-mask-composite custom_all
 -webkit-mask-image custom_all
 -webkit-mask-origin custom_all
 -webkit-mask-position-x custom_all
 -webkit-mask-position-y custom_all
 -webkit-mask-repeat-x custom_all
 -webkit-mask-repeat-y custom_all
 -webkit-mask-size custom_all
--webkit-perspective custom_all
 perspective-origin custom_all
--webkit-perspective-origin custom_all
 -webkit-perspective-origin-x converter=convertLength
 -webkit-perspective-origin-y converter=convertLength
 -webkit-print-color-adjust type_name=PrintColorAdjust
 -webkit-rtl-ordering type_name=Order, setter=setRTLOrdering, initial=initialRTLOrdering
 -webkit-ruby-position type_name=RubyPosition
 -webkit-tap-highlight-color converter=convertColor
 -webkit-text-combine type_name=TextCombine
 -webkit-text-emphasis-color custom_all
 -webkit-text-emphasis-position type_name=TextEmphasisPosition
 -webkit-text-emphasis-style custom_all
 -webkit-text-fill-color custom_all
 -webkit-text-orientation custom_value
 -webkit-text-security
 -webkit-text-stroke-color custom_all
 -webkit-text-stroke-width converter=convertTextStrokeWidth
 text-underline-position type_name=TextUnderlinePosition
 transform custom_value
--webkit-transform use_handlers_for=CSSPropertyTransform
 transform-origin custom_all
 -webkit-transform-origin-x converter=convertLength
 -webkit-transform-origin-y converter=convertLength
 -webkit-transform-origin-z converter=convertComputedLength<float>
 transform-style name_for_methods=TransformStyle3D
--webkit-transform-style name_for_methods=TransformStyle3D
 -webkit-transition-delay custom_all
 -webkit-transition-duration custom_all
 -webkit-transition-property custom_all
 -webkit-transition-timing-function custom_all
 -webkit-user-drag
 -webkit-user-modify
 -webkit-user-select
 -webkit-writing-mode custom_value
 
 alignment-baseline svg
@@ skipping 28 matching lines @@
 stroke-dashoffset svg, name_for_methods=StrokeDashOffset, converter=convertSVGLength
 stroke-linecap svg, type_name=LineCap, name_for_methods=CapStyle
 stroke-linejoin svg, type_name=LineJoin, name_for_methods=JoinStyle
 stroke-miterlimit svg, type_name=float, name_for_methods=StrokeMiterLimit
 stroke-opacity svg, converter=convertNumberOrPercentage
 stroke-width svg, converter=convertSVGLength
 text-anchor svg
 vector-effect svg
 writing-mode svg, type_name=SVGWritingMode
 
--webkit-border-end-color direction_aware
--webkit-border-end-style direction_aware
--webkit-border-end-width direction_aware
--webkit-border-start-color direction_aware
--webkit-border-start-style direction_aware
--webkit-border-start-width direction_aware
--webkit-border-before-color direction_aware
--webkit-border-before-style direction_aware
--webkit-border-before-width direction_aware
--webkit-border-after-color direction_aware
--webkit-border-after-style direction_aware
--webkit-border-after-width direction_aware
--webkit-margin-end direction_aware
--webkit-margin-start direction_aware
--webkit-margin-before direction_aware
--webkit-margin-after direction_aware
--webkit-padding-end direction_aware
--webkit-padding-start direction_aware
--webkit-padding-before direction_aware
--webkit-padding-after direction_aware
--webkit-logical-width direction_aware
--webkit-logical-height direction_aware
--webkit-min-logical-width direction_aware
--webkit-min-logical-height direction_aware
--webkit-max-logical-width direction_aware
--webkit-max-logical-height direction_aware
-
 // FIXME: We should look over these and see if some should actually be
 // marked as unreachable.
 animation-delay skip
 animation-direction skip
 animation-duration skip
 animation-fill-mode skip
 animation-iteration-count skip
 animation-name skip
 animation-play-state skip
 animation-timing-function skip
 transition-delay skip
 transition-duration skip
 transition-property skip
 transition-timing-function skip
 page skip
 src skip
 unicode-range skip
 -webkit-font-size-delta skip
 -webkit-text-decorations-in-effect skip
 max-zoom skip
 min-zoom skip
 user-zoom skip
 orientation skip
 enable-background skip
 invalid skip
 all skip