Change:
}, "css.webkitProperties": { "type": "string", <del> "default": "", </del> <ins> "default": "animation, animation-delay, animation-direction, animation-duration, animation-fill-mode, animation-iteration-count, animation-name, animation-play-state, animation-timing-function, appearance, backface-visibility, background-clip, background-composite, background-origin, background-size, border-fit, border-horizontal-spacing, border-image, border-vertical-spacing, box-align, box-direction, box-flex, box-flex-group, box-lines, box-ordinal-group, box-orient, box-pack, box-reflect, box-shadow, color-correction, column-break-after, column-break-before, column-break-inside, column-count, column-gap, column-rule-color, column-rule-style, column-rule-width, column-span, column-width, dashboard-region, font-smoothing, highlight, hyphenate-character, hyphenate-limit-after, hyphenate-limit-before, hyphens, line-box-contain, line-break, line-clamp, locale, margin-before-collapse, margin-after-collapse, marquee-direction, marquee-increment, marquee-repetition, marquee-style, mask-attachment, mask-box-image, mask-box-image-outset, mask-box-image-repeat, mask-box-image-slice, mask-box-image-source, mask-box-image-width, mask-clip, mask-composite, mask-image, mask-origin, mask-position, mask-repeat, mask-size, nbsp-mode, perspective, perspective-origin, rtl-ordering, text-combine, text-decorations-in-effect, text-emphasis-color, text-emphasis-position, text-emphasis-style, text-fill-color, text-orientation, text-security, text-stroke-color, text-stroke-width, transform, transition, transform-origin, transform-style, transition-delay, transition-duration, transition-property, transition-timing-function, user-drag, user-modify, user-select, writing-mode, svg-shadow, box-sizing, border-radius", </ins> "description": "%emmetPreferencesCssWebkitProperties%" }, "css.mozProperties": { "type": "string", <del> "default": "", </del> <ins> "default": "animation-delay, animation-direction, animation-duration, animation-fill-mode, animation-iteration-count, animation-name, animation-play-state, animation-timing-function, appearance, backface-visibility, background-inline-policy, binding, border-bottom-colors, border-image, border-left-colors, border-right-colors, border-top-colors, box-align, box-direction, box-flex, box-ordinal-group, box-orient, box-pack, box-shadow, box-sizing, column-count, column-gap, column-rule-color, column-rule-style, column-rule-width, column-width, float-edge, font-feature-settings, font-language-override, force-broken-image-icon, hyphens, image-region, orient, outline-radius-bottomleft, outline-radius-bottomright, outline-radius-topleft, outline-radius-topright, perspective, perspective-origin, stack-sizing, tab-size, text-blink, text-decoration-color, text-decoration-line, text-decoration-style, text-size-adjust, transform, transform-origin, transform-style, transition, transition-delay, transition-duration, transition-property, transition-timing-function, user-focus, user-input, user-modify, user-select, window-shadow, background-clip, border-radius", </ins> "description": "%emmetPreferencesCssMozProperties%" }, "css.oProperties": { "type": "string", <del> "default": "", </del> <ins> "default": "dashboard-region, animation, animation-delay, animation-direction, animation-duration, animation-fill-mode, animation-iteration-count, animation-name, animation-play-state, animation-timing-function, border-image, link, link-source, object-fit, object-position, tab-size, table-baseline, transform, transform-origin, transition, transition-delay, transition-duration, transition-property, transition-timing-function, accesskey, input-format, input-required, marquee-dir, marquee-loop, marquee-speed, marquee-style", </ins> "description": "%emmetPreferencesCssOProperties%" }, "css.msProperties": { "type": "string", <del> "default": "", </del> <ins> "default": "accelerator, backface-visibility, background-position-x, background-position-y, behavior, block-progression, box-align, box-direction, box-flex, box-line-progression, box-lines, box-ordinal-group, box-orient, box-pack, content-zoom-boundary, content-zoom-boundary-max, content-zoom-boundary-min, content-zoom-chaining, content-zoom-snap, content-zoom-snap-points, content-zoom-snap-type, content-zooming, filter, flow-from, flow-into, font-feature-settings, grid-column, grid-column-align, grid-column-span, grid-columns, grid-layer, grid-row, grid-row-align, grid-row-span, grid-rows, high-contrast-adjust, hyphenate-limit-chars, hyphenate-limit-lines, hyphenate-limit-zone, hyphens, ime-mode, interpolation-mode, layout-flow, layout-grid, layout-grid-char, layout-grid-line, layout-grid-mode, layout-grid-type, line-break, overflow-style, perspective, perspective-origin, perspective-origin-x, perspective-origin-y, scroll-boundary, scroll-boundary-bottom, scroll-boundary-left, scroll-boundary-right, scroll-boundary-top, scroll-chaining, scroll-rails, scroll-snap-points-x, scroll-snap-points-y, scroll-snap-type, scroll-snap-x, scroll-snap-y, scrollbar-arrow-color, scrollbar-base-color, scrollbar-darkshadow-color, scrollbar-face-color, scrollbar-highlight-color, scrollbar-shadow-color, scrollbar-track-color, text-align-last, text-autospace, text-justify, text-kashida-space, text-overflow, text-size-adjust, text-underline-position, touch-action, transform, transform-origin, transform-origin-x, transform-origin-y, transform-origin-z, transform-style, transition, transition-delay, transition-duration, transition-property, transition-timing-function, user-select, word-break, wrap-flow, wrap-margin, wrap-through, writing-mode", </ins> "description": "%emmetPreferencesCssMsProperties%" } }

Discussion:
VSCode Version: Code 1.17.0 (, 2017-10-05T06:07:51.906Z) OS Version: Darwin x64 16.7.0 Extensions: ExtensionVersion ------ vscode-markdownlint0.10.1 xml1.9.2 code-settings-sync2.8.3 sonarlint-vscode1.1.0 html-snippets0.1.0 Bookmarks0.16.0 markdown-preview-github-styles0.0.4 path-intellisense1.4.2 gitignore0.5.0 vscode-eslint1.3.2 githistory0.2.3 jquerysnippets0.0.1 tslint1.0.9 auto-rename-tag0.0.14 Angular22.7.0 HTMLHint0.4.0 cpptools0.13.1 csharp1.12.1 indent-rainbow0.7.2 tsimporter1.2.14 java0.11.0 vscode-open0.1.0 stylelint0.29.1 code-spell-checker1.4.7 code-spell-checker-spanish1.0.1 bootstrap-3-snippets0.1.0 JavaScriptSnippets1.5.0 Steps to Reproduce: new CSS file to add -bdrd with vendor-prefixed as mention in emmet documentation adding a hyphen before. But not show any suggestion or auto-complation list. Expected result: Emmet Documentation: I'm not see in his documentation if there is a way or option to enable this behaviour: <!-- Launch with to check. --Reproduces without extensions: Yes
You are right, expanding the abbreviations so that all vendor prefixes are included is not supported in Emmet 2.0 Have you used the command? We could just overload that command to add missing vendor prefixes or have a new command to do the same.
I'm not using it, but I think is better add it to a new command.
Note to verifier: The vendor prefixes should be attached as documented in when using the command.