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WebKit Environment variables
This page documents some environment variables that you can use to change the behaviour of WebKit.
This documentation may be outdated or incomplete. If you wish, you can grep the sourcecode for getenv strings and update this document.
List of WebKit environment variables
- Use the following environment variables as:
export Variable="Value" $WebKitCommand
Variable | Value | Meaning | WebKit ports |
---|---|---|---|
GIGACAGE_ENABLED | 0 | Disable gigacage (needed to use valgrind) | ALL |
JavaScriptCoreUseJIT | 0 | Disable the JavaScript JIT | ALL |
JSC_useFTLJIT | 0 | Disable the JavaScript FTL JIT | ALL |
JSC_dumpOptions | 3 | Dumps all the JSC options available to tweak | ALL |
JSC_${option from previous command} | ${value} | ${check with JSC_dumpOptions=3} | ALL |
Malloc | 1 | Disable bmalloc memory allocator and use the system default one instead. On Darwin systems, also set __XPC_Malloc in order to pass on the value to child processes | ALL |
MSE_MAX_BUFFER_SIZE | Examples: V:50M,audio:12k,TeXT:500K *:100M video:90M,T:100000 | Set maximum SourceBuffer sizes for audio/video/text (when implemented) media types. Case insensitive, full type (audio, video, text) or compact type (a, v, t), wildcard (*) allowed, unit multipliers allowed (K, M). | WPE WebKit |
WEBKIT_FORCE_COMPOSITING_MODE | 1 | Force Accelerated Compositing mode to be always on | WebKitGTK (since 2.10.5) |
WEBKIT_DISABLE_COMPOSITING_MODE | 1 | Force Accelerated Compositing mode to be always off | WebKitGTK (since 2.10.9) |
WEBKIT_INSPECTOR_SERVER | ${ip.ad.dre.ss}:${port} | Enables the Remote WebInspector at inspector://${ip.ad.dre.ss}:${port} (NOTE: Use a WebKitGTK or WPE WebKit based browser to load the address) | WebKitGTK and WPE WebKit |
WEBKIT_INSPECTOR_HTTP_SERVER | ${ip.ad.dre.ss}:${port} | Enables the Remote HTTP WebInspector at http://${ip.ad.dre.ss}:${port} (NOTE: You can access to it from any browser, but works better from a WebKit based browser) | WebKitGTK and WPE WebKit |
WEBKIT_SHOW_FPS | 1 | Shows a small square with the FPS measured at the top-right corner of the web view | WebKitGTK and WPE WebKit |
WEBKIT_SAMPLE_MEMORY | 1 | Generates in /tmp some text files with memory stats. | WebKitGTK (since 2.15.2) and WPE WebKit |
WEBKIT_FORCE_SANDBOX | 1 | Force enables the web process sandbox | WebKitGTK (since 2.23.1), not yet available for WPE WebKit |
WEBKIT_ENABLE_DBUS_PROXY_LOGGING | 1 | Use for debugging the the sandbox's D-Bus proxy | WebKitGTK (since 2.23.1), not yet available for WPE WebKit |
WEBKIT_WEBRTC_DISABLE_UNIFIED_PLAN | 1 | Use to disable Unified Plan as SDP format | WebKitGTK and WPE WebKit (since 2.23.1) |
WEBKIT_FORCE_COMPLEX_TEXT | 0 | Confusing! Use only to disable complex text codepath | WebKitGTK (since 2.22.0), not available for WPE WebKit |
WEBKIT_DISABLE_MEMORY_PRESSURE_MONITOR | 1 | Use to disable memory pressure monitor | WebKitGTK and WPE WebKit (since 2.22.0) |
WEBKIT_GST_DISABLE_FAST_MALLOC | 1 | Use to disable the GStreamer FastMalloc allocator | WebKitGTK and WPE WebKit |
WEBKIT_GST_MAX_AVC1_RESOLUTION | Set to 1080P, 720P or 480P to max out the H264/AVC1 resolution advertised as supported by the GStreamer media-capabilities backend | WebKitGTK and WPE WebKit (since 2.25.2) | |
WEBKIT_GST_USE_PLAYBIN3 | 1 | Enable the next-generation playbin3 element for media playback (MSE not supported yet) | WebKitGTK and WPE WebKit |
WEBKIT_GST_ENABLE_LEGACY_VAAPI | 1 | Allow use of gstreamer-vaapi element for hardware decoding (deprecated) | WebKitGTK and WPE WebKit (since 2.36.3) |
WEBKIT_EGL_PIXEL_LAYOUT | RGB565 | Set the EGL pixel format used for rendering | WPE WebKit |
WEBKIT_DEBUG | all or ${channel} | Enable debugging channels. Check WebKitGTK/Debugging#Loggingsupport for more info | WebKitGTK and WPE WebKit |
WPE_SHELL_DISABLE_MEDIA_DISK_CACHE | 1 | Disable on-disk cache for regular (no MSE) video playback | WPE WebKit |
WPE_SHELL_MEDIA_DISK_CACHE_PATH | /some/directory/path | Set custom path for on-disk cache for regular (no MSE) video playback | WPE WebKit |
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