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List of ENABLE flags
3D_PLUGIN
3D_RENDERING
8BIT_TEXTRUN
Turns on code to create 8 bit TextRun's. The features requires that text rendering code can handle both 8 and 16 bit TextRun's.
ACCELERATED_2D_CANVAS
ACCELERATED_OVERFLOW_SCROLLING
BATTERY_STATUS
BLOB
CANVAS_PATH
CALENDAR_PICKER
Calendar picker UI built in WebCore. It's implemented with HTML+JavaScript, and supports type=date, type=datetime, type=datetime-local, type=month, and type=week. This feature requires ENABLE_PAGE_POPUP. See EnableFormFeatures.
CHANNEL_MESSAGING
CONTEXT_MENUS
CSP_NEXT
Content-Security-Policy 1.1. Announcement. http://webkit.org/b/85558.
CSS_BOX_DECORATION_BREAK
box-decoration-break CSS property. http://webkit.org/b/27576.
CSS_COMPOSITING
Compositing and Blending. Announcement. http://webkit.org/b/91908. Under development.
CSS_EXCLUSIONS
CSS Exclusions and Shapes Module Level 3. Meta tracking bug. Under development. Contributors: betravis, hansmuller, bemjb, Zoltan Horvath (Zoltan), and others.
CSS_FILTERS
CSS_GRID_LAYOUT
http://dev.w3.org/csswg/css-grid/. Announcement. Contributors: none.
CSS_IMAGE_ORIENTATION
image-orientation CSS property. Announcement. http://webkit.org/b/89052
CSS_IMAGE_RESOLUTION
image-resolution CSS property. Announcement. http://webkit.org/b/85262
CSS_IMAGE_SET
CSS_REGIONS
CSS Regions specification CSS Regions meta bug Under development.
CSS_SHADERS
aka CSS Custom Filters. Custom Filter section of CSS Filter Effects specification. CSS Shaders meta bug. Under development. Contributors: achicu, mvujovic, michelangelo, and others. Reviewers: dino, krit.
CSS_STICKY_POSITION
CSS position:sticky. Announcement. http://webkit.org/b/90046.
CSS_TRANSFORMS_ANIMATIONS_UNPREFIXED
Announcement. http://webkit.org/b/93136 Under development as they are few things to do before shipping them. Enabled by default in trunk.
CSS_VARIABLES
CSS Variables Module. Announcement. Under development. Contributors: none.
CSS3_CONDITIONAL_RULES
CSS3 @supports rule. @supports in the css3-conditional specification. Announcement. https://webkit.org/b/86146.
CSS3_TEXT
CSS3 Text Decoration specification. Announcement. Master bug Under development.
CSS3 text-align-last specification Announcement. Master bug Under development.
CSS3 text-justify specification Master bug Under development.
CSS3_TEXT_LINE_BREAK
CSS line-break property. Meta Bug. Contributors: gasubic.
CURSOR_VISIBILITY
https://bugs.webkit.org/show_bug.cgi?id=107601 Under development.
CUSTOM_ELEMENTS
https://bugs.webkit.org/show_bug.cgi?id=99688.
CUSTOM_SCHEME_HANDLER
isProtocolHandlerRegistered() and unregisterProtocolHandler() of Custom scheme and content handlers.
DASHBOARD_SUPPORT
DATALIST_ELEMENT
<datalist> support. Stable. Need platform-specific implementation.
DATA_TRANSFER_ITEMS
DATE_AND_TIME_INPUT_TYPES
An alias of ENABLE(INPUT_TYPE_DATE) || ENABLE(INPUT_TYPE_DATETIME) || ENABLE(INPUT_TYPE_DATETIMELOCAL) || ENABLE(INPUT_TYPE_MONTH) || ENABLE(INPUT_TYPE_TIME) || ENABLE(INPUT_TYPE_WEEK). We shouldn't enable/disable this flag explicitly.
DEBUG_MATH_LAYOUT
DELETION_UI
DETAILS_ELEMENT
<details> and <summary> support. Stable.
DEVICE_ORIENTATION
DIALOG_ELEMENT
<dialog> support. Announcement. http://webkit.org/b/84635. Under development. Contributors: none.
DIRECTORY_UPLOAD
<input type=file webkitdirectory> support. Experimental.
DOM4_EVENTS_CONSTRUCTOR
Constructor support for DOM events. Meta bug.
DOWNLOAD_ATTRIBUTE
DRAG_SUPPORT
DRAGGABLE_REGION
Currently only supported in chromium port. http://lists.webkit.org/pipermail/webkit-dev/2012-June/021257.html
ENCRYPTED_MEDIA
Encrypted Media Extensions. Announcement.
ENCRYPTED_MEDIA_V2
EVENT_MODE_METATAGS
FAST_MOBILE_SCROLLING
FILE_SYSTEM
Contributors: none.
FILTERS
Image filter implementation. SVG Filter feature is available if ENABLE(SVG) && ENABLE(FILTERS).
FONT_LOAD_EVENTS
CSS Font Load Events Module. Announcement. Meta bug. Under development.
FTPDIR
FULLSCREEN_API
GAMEPAD
GEOLOCATION
GESTURE_EVENTS
GLOBAL_FASTMALLOC_NEW
Part of the Custom Allocation Framework. Contributors: Zoltan Horvath (Zoltan)
HIDDEN_PAGE_DOM_TIMER_THROTTLING
http://lists.webkit.org/pipermail/webkit-dev/2012-October/022458.html http://webkit.org/b/98474. Experimental.
HIGH_DPI_CANVAS
ICONDATABASE
IFRAME_SEAMLESS
<iframe seamless> support. http://webkit.org/b/85822
IMAGE_DECODER_DOWN_SAMPLING
INDEXED_DATABASE
Shipped in GTK+ and EFL ports.
INPUT_MULTIPLE_FIELDS_UI
Introduced by http://webkit.org/b/97640 for using multiple fields UI in "date", "datetime", "datetime-local", "month", "time" and "week". This flag was named INPUT_TYPE_TIME_MULTIPLE_FIELDS http://webkit.org/b/88970. Announcement.
This flag provides inline editing UI for these input types. This UI is not suitable for mobile platforms.
See EnableFormFeatures.
INPUT_SPEECH
<input x-webkit-speech> support. Experimental.
INPUT_TYPE_COLOR
<input type=color> support. Stable. Need platform-specific code in ChromeClient.
INPUT_TYPE_DATE
<input type=date> support. See EnableFormFeatures.
INPUT_TYPE_DATETIME_INCOMPLETE
<input type=datetime> support. The implementation is still useless. Do not enable this.
INPUT_TYPE_DATETIMELOCAL
<input type=datetime-local> support. See EnableFormFeatures.
INPUT_TYPE_MONTH
<input type=month> support. See EnableFormFeatures.
INPUT_TYPE_TIME
<input type=time> support. See EnableFormFeatures.
INPUT_TYPE_WEEK
<input type=week> support. See EnableFormFeatures.
INSPECTOR
Backend Web Inspector support. Stable. For the front-end: contributors: Roland Takacs (rtakacs).
JAVASCRIPT_DEBUGGER
LEGACY_CSS_VENDOR_PREFIXES
Support for -khtml- and -apple- vendor prefixes.
LEGACY_NOTIFICATIONS
Contributors: none.
LEGACY_VENDOR_PREFIXES
Obsolete prefixed APIs should be wrapped by this.
LEGACY_VIEWPORT_ADAPTION
LINK_PREFETCH
LINK_PRERENDER
MATHML
MathML support.
MEDIA_CAPTURE
HTML Media Capture support. Announcement. Support only 'capture' attribute for now.
MEDIA_SOURCE
MEDIA_STATISTICS
MEDIA_STREAM
METER_ELEMENT
<meter> support. Stable.
MHTML
MICRODATA
MOUSE_CURSOR_SCALE
Allows mouse cursors to carry information about the scale of image pixels to logical UI pixels, eg. from -webkit-image-set.
Announcement. specification Master bug
NAVIGATOR_CONTENT_UTILS
registerProtocolHandler, etc.
NETSCAPE_PLUGIN_API
NETSCAPE_PLUGIN_METADATA_CACHE
NETWORK_INFO
Announcement. EFL and Blackberry ports supports this feature partially.
NOSNIFF
NOTIFICATIONS
OPENCL
Enable OpenCL based optimizations.
OPENTYPE_VERTICAL
ORIENTATION_EVENTS
PAGE_POPUP
Internal API to provide HTML-capable popup. This is needed for ENABLE_CALENDAR_PICKER. This needs ChromeClient implementation.
PAGE_VISIBILITY_API
PAN_SCROLLING
PARSED_STYLE_SHEET_CACHING
PLUGIN_PACKAGE_SIMPLE_HASH
PLUGIN_PROXY_FOR_VIDEO
POINTER_LOCK
PROGRESS_ELEMENT
<progress> support. Stable. Need to implement functions of RenderTheme.
PROXIMITY_EVENTS
http://webkit.org/b/92837. Under development.
QUOTA
REPAINT_THROTTLING
REQUEST_ANIMATION_FRAME
RUBBER_BANDING
SATURATED_LAYOUT_ARITHMETIC
SCRIPTED_SPEECH
Under development.
SHADOW_DOM
Shadow DOM support. Experimental. Contributors: none.
SHARED_WORKERS
SMOOTH_SCROLLING
SPELLCHECK
SPEECH_SYNTHESIS
Announcement. Meta Bug. Under development.
SQL_DATABASE
STREAM
STYLE_SCOPED
<style scoped> support. Experimental.
SUBPIXEL_LAYOUT
LayoutUnit Meta Bug for Enabling on All Platforms Contributors: None
I would volunteer to help with issues here - but my understanding is far from the level of Levi and Emil. (Dominik Röttsches (drott))
SVG
SVG support. Stable.
SVG_DOM_OBJC_BINDINGS
SVG_FONTS
TEMPLATE_ELEMENT
TEXT_AUTOSIZING
Announcement. http://webkit.org/b/84186. Under development.
TEXT_CARET
THREADED_HTML_PARSER
Announcement. Meta Bug. Contributors: none. Under development.
THREADED_SCROLLING
THREADING_GENERIC
TOUCH_EVENTS
TOUCH_ICON_LOADING
VIBRATION
VIDEO
<video> and <audio> support. Stable.
VIDEO_TRACK
VIEWPORT
VIEWPORT_REFLOW
VIEWSOURCE_ATTRIBUTE
iframe/@viewsource. Bug
VIEW_MODE_CSS_MEDIA
Bug.
WEBGL
WEB_ARCHIVE
WEB_AUDIO
WEB_INTENTS
WEB_SOCKETS
WebSocket support. Stable.
WEB_TIMING
Contributors: none.
WORKERS
WTF_MALLOC_VALIDATION
XHR_TIMEOUT
See also https://bugs.webkit.org/show_bug.cgi?id=100356 , temporary flag until all network backends have support for setTimeoutInterval (tracked in https://bugs.webkit.org/show_bug.cgi?id=98397)
XSLT
JavaScriptCore flags
ASSEMBLER
ASSEMBLER_WX_EXCLUSIVE
CODEBLOCK_SAMPLING
COMPUTED_GOTO_OPCODES
DEBUG_WITH_BREAKPOINT
DFG_JIT
EXECUTABLE_ALLOCATOR_DEMAND
EXECUTABLE_ALLOCATOR_FIXED
GC_LOGGING
GC_VALIDATION
GGC
JIT
JIT_CONSTANT_BLINDING
JIT_VERBOSE
JIT_VERBOSE_OSR
OPCODE_SAMPLING
OPCODE_STATS
LLINT
META_ALLOCATOR_PROFILE
PARALLEL_GC
REGEXP_TRACING
SAMPLING_COUNTERS
SAMPLING_FLAGS
SAMPLING_REGIONS
SAMPLING_THREAD
SIMPLE_HEAP_PROFILING
VALUE_PROFILER
VERBOSE_VALUE_PROFILE
WRITE_BARRIER_PROFILING
YARR_JIT
YARR_JIT_DEBUG
WebKit2 flags
MEMORY_SAMPLER
PLUGIN_PROCESS
WEB_PROCESS_SANDBOX
Platform-specific flags
BLACKBERRY_CREDENTIAL_PERSIST
Blackberry
BLACKBERRY_DEBUG_MEMORY
Blackberry
JAVASCRIPT_I18N_API
V8-only. Experimental.
PURGEABLE_MEMORY
Mac
WEBDOM
Blackberry
