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API categories | API index

Command line switches

Table of contents:

Preface

There are many settings that can be customized through Chromium command line switches. These switches can only be set programmatically by passing a dictionary of switches as a second argument to cefpython.Initialize(applicationSettings, commandLineSwitches). The commandLineSwitches param is a dictionary with switch name as a key. The switch name should not contain the "-" or "--" prefix, otherwise it will be ignored. Switch value may be an empty string, if the switch doesn't require a value. These switches are set for the main process and all subprocesses. See the description of the cefpython.Initialize() function to see how to preview the final command line strings formed by CEF.

There are two types of switches, Chromium switches and CEF switches:

Some of the switches in Chromium are experimental, and may crash application if used inappropriately.

When debbugging is On, the whole command line string will be displayed in console, with both CEF switches set internally, and the ones appended by cefpython. On Linux you will also see in console the command line string for subprocesses. On Windows, command line strings for subprocesses won't be seen in console, you can view them by opening the debug.log file. Example command line strings from debug logs, for the main process and the renderer process:

# Main process
python --browser-subprocess-path="C:\cefpython\cefpython\cef3\windows\binaries
/subprocess" --lang=en-US --log-file="C:\cefpython\cefpython\cef3\windows
\binaries\debug.log" --log-severity=info --enable-release-dcheck
--no-sandbox wxpython.py
# Renderer process
"C:\cefpython\cefpython\cef3\windows\binaries/subprocess" --type=renderer
--no-sandbox --lang=en-US --lang=en-US --log-file="C:\cefpython\cefpython\
cef3\windows\binaries\debug.log" --log-severity=info --enable-release-dcheck
--channel="4152.0.209609692\1183564454" /prefetch:673131151

Example switches

enable-media-stream

To enable media (WebRTC audio/video) streaming set the "enable-media-stream" CEF switch. This will enable the getUserMedia function in javascript.

proxy-server

To set custom proxy set the "proxy-server" Chromium switch to "socks5://127.0.0.1:8888" for example. See also Proxy Resolution page.

no-proxy-server

By default Chromium uses the IE proxy settings (set in Internet Explorer options), to disable that set the "no-proxy-server" Chromium switch. See also Proxy Resolution page.

disable-gpu

Disable GPU rendering and switch to CPU software rendering. This flag can fix the black/white browser screen issue.

Chromium switches by category

The peter.sh website should list all Chromium switches that are assembled from many Chromium files. Though, some switches may be missing there. Here is a list (in some way categorized) of all Chromium source files that define switches (list assembled on January 16, 2014):

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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API categories | API index
Command line switches
Table of contents:
Preface
There are many settings that can be customized through Chromium command line switches. These switches can only be set programmatically by passing a dictionary of switches as a second argument to cefpython.Initialize(applicationSettings, commandLineSwitches). The commandLineSwitches param is a dictionary with switch name as a key. The switch name should not contain the "-" or "--" prefix, otherwise it will be ignored. Switch value may be an empty string, if the switch doesn't require a value. These switches are set for the main process and all subprocesses. See the description of the cefpython.Initialize() function to see how to preview the final command line strings formed by CEF.
There are two types of switches, Chromium switches and CEF switches:
Some of the switches in Chromium are experimental, and may crash application if used inappropriately.
When debbugging is On, the whole command line string will be displayed in console, with both CEF switches set internally, and the ones appended by cefpython. On Linux you will also see in console the command line string for subprocesses. On Windows, command line strings for subprocesses won't be seen in console, you can view them by opening the debug.log file. Example command line strings from debug logs, for the main process and the renderer process:
# Main process
python --browser-subprocess-path="C:\cefpython\cefpython\cef3\windows\binaries
/subprocess" --lang=en-US --log-file="C:\cefpython\cefpython\cef3\windows
\binaries\debug.log" --log-severity=info --enable-release-dcheck
--no-sandbox wxpython.py
# Renderer process
"C:\cefpython\cefpython\cef3\windows\binaries/subprocess" --type=renderer
--no-sandbox --lang=en-US --lang=en-US --log-file="C:\cefpython\cefpython\
cef3\windows\binaries\debug.log" --log-severity=info --enable-release-dcheck
--channel="4152.0.209609692\1183564454" /prefetch:673131151

Example switches
enable-media-stream
To enable media (WebRTC audio/video) streaming set the "enable-media-stream" CEF switch. This will enable the getUserMedia function in javascript.
proxy-server
To set custom proxy set the "proxy-server" Chromium switch to "socks5://127.0.0.1:8888" for example. See also Proxy Resolution page.
no-proxy-server
By default Chromium uses the IE proxy settings (set in Internet Explorer options), to disable that set the "no-proxy-server" Chromium switch. See also Proxy Resolution page.
disable-gpu
Disable GPU rendering and switch to CPU software rendering. This flag can fix the black/white browser screen issue.
Chromium switches by category
The peter.sh website should list all Chromium switches that are assembled from many Chromium files. Though, some switches may be missing there. Here is a list (in some way categorized) of all Chromium source files that define switches (list assembled on January 16, 2014):

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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API categories | API index
Command line switches
Table of contents:
Preface
There are many settings that can be customized through Chromium command line switches. These switches can only be set programmatically by passing a dictionary of switches as a second argument to cefpython.Initialize(applicationSettings, commandLineSwitches). The commandLineSwitches param is a dictionary with switch name as a key. The switch name should not contain the "-" or "--" prefix, otherwise it will be ignored. Switch value may be an empty string, if the switch doesn't require a value. These switches are set for the main process and all subprocesses. See the description of the cefpython.Initialize() function to see how to preview the final command line strings formed by CEF.
There are two types of switches, Chromium switches and CEF switches:
Some of the switches in Chromium are experimental, and may crash application if used inappropriately.
When debbugging is On, the whole command line string will be displayed in console, with both CEF switches set internally, and the ones appended by cefpython. On Linux you will also see in console the command line string for subprocesses. On Windows, command line strings for subprocesses won't be seen in console, you can view them by opening the debug.log file. Example command line strings from debug logs, for the main process and the renderer process:
# Main process
python --browser-subprocess-path="C:\cefpython\cefpython\cef3\windows\binaries
/subprocess" --lang=en-US --log-file="C:\cefpython\cefpython\cef3\windows
\binaries\debug.log" --log-severity=info --enable-release-dcheck
--no-sandbox wxpython.py
# Renderer process
"C:\cefpython\cefpython\cef3\windows\binaries/subprocess" --type=renderer
--no-sandbox --lang=en-US --lang=en-US --log-file="C:\cefpython\cefpython\
cef3\windows\binaries\debug.log" --log-severity=info --enable-release-dcheck
--channel="4152.0.209609692\1183564454" /prefetch:673131151

Example switches
enable-media-stream
To enable media (WebRTC audio/video) streaming set the "enable-media-stream" CEF switch. This will enable the getUserMedia function in javascript.
proxy-server
To set custom proxy set the "proxy-server" Chromium switch to "socks5://127.0.0.1:8888" for example. See also Proxy Resolution page.
no-proxy-server
By default Chromium uses the IE proxy settings (set in Internet Explorer options), to disable that set the "no-proxy-server" Chromium switch. See also Proxy Resolution page.
disable-gpu
Disable GPU rendering and switch to CPU software rendering. This flag can fix the black/white browser screen issue.
Chromium switches by category
The peter.sh website should list all Chromium switches that are assembled from many Chromium files. Though, some switches may be missing there. Here is a list (in some way categorized) of all Chromium source files that define switches (list assembled on January 16, 2014):

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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API categories | API index
Command line switches
Table of contents:
Preface
There are many settings that can be customized through Chromium command line switches. These switches can only be set programmatically by passing a dictionary of switches as a second argument to cefpython.Initialize(applicationSettings, commandLineSwitches). The commandLineSwitches param is a dictionary with switch name as a key. The switch name should not contain the "-" or "--" prefix, otherwise it will be ignored. Switch value may be an empty string, if the switch doesn't require a value. These switches are set for the main process and all subprocesses. See the description of the cefpython.Initialize() function to see how to preview the final command line strings formed by CEF.
There are two types of switches, Chromium switches and CEF switches:
Some of the switches in Chromium are experimental, and may crash application if used inappropriately.
When debbugging is On, the whole command line string will be displayed in console, with both CEF switches set internally, and the ones appended by cefpython. On Linux you will also see in console the command line string for subprocesses. On Windows, command line strings for subprocesses won't be seen in console, you can view them by opening the debug.log file. Example command line strings from debug logs, for the main process and the renderer process:
# Main process
python --browser-subprocess-path="C:\cefpython\cefpython\cef3\windows\binaries
/subprocess" --lang=en-US --log-file="C:\cefpython\cefpython\cef3\windows
\binaries\debug.log" --log-severity=info --enable-release-dcheck
--no-sandbox wxpython.py
# Renderer process
"C:\cefpython\cefpython\cef3\windows\binaries/subprocess" --type=renderer
--no-sandbox --lang=en-US --lang=en-US --log-file="C:\cefpython\cefpython\
cef3\windows\binaries\debug.log" --log-severity=info --enable-release-dcheck
--channel="4152.0.209609692\1183564454" /prefetch:673131151

Example switches
enable-media-stream
To enable media (WebRTC audio/video) streaming set the "enable-media-stream" CEF switch. This will enable the getUserMedia function in javascript.
proxy-server
To set custom proxy set the "proxy-server" Chromium switch to "socks5://127.0.0.1:8888" for example. See also Proxy Resolution page.
no-proxy-server
By default Chromium uses the IE proxy settings (set in Internet Explorer options), to disable that set the "no-proxy-server" Chromium switch. See also Proxy Resolution page.
disable-gpu
Disable GPU rendering and switch to CPU software rendering. This flag can fix the black/white browser screen issue.
Chromium switches by category
The peter.sh website should list all Chromium switches that are assembled from many Chromium files. Though, some switches may be missing there. Here is a list (in some way categorized) of all Chromium source files that define switches (list assembled on January 16, 2014):

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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API categories | API index
Command line switches
Table of contents:
Preface
There are many settings that can be customized through Chromium command line switches. These switches can only be set programmatically by passing a dictionary of switches as a second argument to cefpython.Initialize(applicationSettings, commandLineSwitches). The commandLineSwitches param is a dictionary with switch name as a key. The switch name should not contain the "-" or "--" prefix, otherwise it will be ignored. Switch value may be an empty string, if the switch doesn't require a value. These switches are set for the main process and all subprocesses. See the description of the cefpython.Initialize() function to see how to preview the final command line strings formed by CEF.
There are two types of switches, Chromium switches and CEF switches:
Some of the switches in Chromium are experimental, and may crash application if used inappropriately.
When debbugging is On, the whole command line string will be displayed in console, with both CEF switches set internally, and the ones appended by cefpython. On Linux you will also see in console the command line string for subprocesses. On Windows, command line strings for subprocesses won't be seen in console, you can view them by opening the debug.log file. Example command line strings from debug logs, for the main process and the renderer process:
# Main process
python --browser-subprocess-path="C:\cefpython\cefpython\cef3\windows\binaries
/subprocess" --lang=en-US --log-file="C:\cefpython\cefpython\cef3\windows
\binaries\debug.log" --log-severity=info --enable-release-dcheck
--no-sandbox wxpython.py
# Renderer process
"C:\cefpython\cefpython\cef3\windows\binaries/subprocess" --type=renderer
--no-sandbox --lang=en-US --lang=en-US --log-file="C:\cefpython\cefpython\
cef3\windows\binaries\debug.log" --log-severity=info --enable-release-dcheck
--channel="4152.0.209609692\1183564454" /prefetch:673131151

Example switches
enable-media-stream
To enable media (WebRTC audio/video) streaming set the "enable-media-stream" CEF switch. This will enable the getUserMedia function in javascript.
proxy-server
To set custom proxy set the "proxy-server" Chromium switch to "socks5://127.0.0.1:8888" for example. See also Proxy Resolution page.
no-proxy-server
By default Chromium uses the IE proxy settings (set in Internet Explorer options), to disable that set the "no-proxy-server" Chromium switch. See also Proxy Resolution page.
disable-gpu
Disable GPU rendering and switch to CPU software rendering. This flag can fix the black/white browser screen issue.
Chromium switches by category
The peter.sh website should list all Chromium switches that are assembled from many Chromium files. Though, some switches may be missing there. Here is a list (in some way categorized) of all Chromium source files that define switches (list assembled on January 16, 2014):

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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API categories | API index
Command line switches
Table of contents:
Preface
There are many settings that can be customized through Chromium command line switches. These switches can only be set programmatically by passing a dictionary of switches as a second argument to cefpython.Initialize(applicationSettings, commandLineSwitches). The commandLineSwitches param is a dictionary with switch name as a key. The switch name should not contain the "-" or "--" prefix, otherwise it will be ignored. Switch value may be an empty string, if the switch doesn't require a value. These switches are set for the main process and all subprocesses. See the description of the cefpython.Initialize() function to see how to preview the final command line strings formed by CEF.
There are two types of switches, Chromium switches and CEF switches:
Some of the switches in Chromium are experimental, and may crash application if used inappropriately.
When debbugging is On, the whole command line string will be displayed in console, with both CEF switches set internally, and the ones appended by cefpython. On Linux you will also see in console the command line string for subprocesses. On Windows, command line strings for subprocesses won't be seen in console, you can view them by opening the debug.log file. Example command line strings from debug logs, for the main process and the renderer process:
# Main process
python --browser-subprocess-path="C:\cefpython\cefpython\cef3\windows\binaries
/subprocess" --lang=en-US --log-file="C:\cefpython\cefpython\cef3\windows
\binaries\debug.log" --log-severity=info --enable-release-dcheck
--no-sandbox wxpython.py
# Renderer process
"C:\cefpython\cefpython\cef3\windows\binaries/subprocess" --type=renderer
--no-sandbox --lang=en-US --lang=en-US --log-file="C:\cefpython\cefpython\
cef3\windows\binaries\debug.log" --log-severity=info --enable-release-dcheck
--channel="4152.0.209609692\1183564454" /prefetch:673131151

Example switches
enable-media-stream
To enable media (WebRTC audio/video) streaming set the "enable-media-stream" CEF switch. This will enable the getUserMedia function in javascript.
proxy-server
To set custom proxy set the "proxy-server" Chromium switch to "socks5://127.0.0.1:8888" for example. See also Proxy Resolution page.
no-proxy-server
By default Chromium uses the IE proxy settings (set in Internet Explorer options), to disable that set the "no-proxy-server" Chromium switch. See also Proxy Resolution page.
disable-gpu
Disable GPU rendering and switch to CPU software rendering. This flag can fix the black/white browser screen issue.
Chromium switches by category
The peter.sh website should list all Chromium switches that are assembled from many Chromium files. Though, some switches may be missing there. Here is a list (in some way categorized) of all Chromium source files that define switches (list assembled on January 16, 2014):

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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API categories | API index
Command line switches
Table of contents:
Preface
There are many settings that can be customized through Chromium command line switches. These switches can only be set programmatically by passing a dictionary of switches as a second argument to cefpython.Initialize(applicationSettings, commandLineSwitches). The commandLineSwitches param is a dictionary with switch name as a key. The switch name should not contain the "-" or "--" prefix, otherwise it will be ignored. Switch value may be an empty string, if the switch doesn't require a value. These switches are set for the main process and all subprocesses. See the description of the cefpython.Initialize() function to see how to preview the final command line strings formed by CEF.
There are two types of switches, Chromium switches and CEF switches:
Some of the switches in Chromium are experimental, and may crash application if used inappropriately.
When debbugging is On, the whole command line string will be displayed in console, with both CEF switches set internally, and the ones appended by cefpython. On Linux you will also see in console the command line string for subprocesses. On Windows, command line strings for subprocesses won't be seen in console, you can view them by opening the debug.log file. Example command line strings from debug logs, for the main process and the renderer process:
# Main process
python --browser-subprocess-path="C:\cefpython\cefpython\cef3\windows\binaries
/subprocess" --lang=en-US --log-file="C:\cefpython\cefpython\cef3\windows
\binaries\debug.log" --log-severity=info --enable-release-dcheck
--no-sandbox wxpython.py
# Renderer process
"C:\cefpython\cefpython\cef3\windows\binaries/subprocess" --type=renderer
--no-sandbox --lang=en-US --lang=en-US --log-file="C:\cefpython\cefpython\
cef3\windows\binaries\debug.log" --log-severity=info --enable-release-dcheck
--channel="4152.0.209609692\1183564454" /prefetch:673131151

Example switches
enable-media-stream
To enable media (WebRTC audio/video) streaming set the "enable-media-stream" CEF switch. This will enable the getUserMedia function in javascript.
proxy-server
To set custom proxy set the "proxy-server" Chromium switch to "socks5://127.0.0.1:8888" for example. See also Proxy Resolution page.
no-proxy-server
By default Chromium uses the IE proxy settings (set in Internet Explorer options), to disable that set the "no-proxy-server" Chromium switch. See also Proxy Resolution page.
disable-gpu
Disable GPU rendering and switch to CPU software rendering. This flag can fix the black/white browser screen issue.
Chromium switches by category
The peter.sh website should list all Chromium switches that are assembled from many Chromium files. Though, some switches may be missing there. Here is a list (in some way categorized) of all Chromium source files that define switches (list assembled on January 16, 2014):

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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API categories | API index
Command line switches
Table of contents:
Preface
There are many settings that can be customized through Chromium command line switches. These switches can only be set programmatically by passing a dictionary of switches as a second argument to cefpython.Initialize(applicationSettings, commandLineSwitches). The commandLineSwitches param is a dictionary with switch name as a key. The switch name should not contain the "-" or "--" prefix, otherwise it will be ignored. Switch value may be an empty string, if the switch doesn't require a value. These switches are set for the main process and all subprocesses. See the description of the cefpython.Initialize() function to see how to preview the final command line strings formed by CEF.
There are two types of switches, Chromium switches and CEF switches:
Some of the switches in Chromium are experimental, and may crash application if used inappropriately.
When debbugging is On, the whole command line string will be displayed in console, with both CEF switches set internally, and the ones appended by cefpython. On Linux you will also see in console the command line string for subprocesses. On Windows, command line strings for subprocesses won't be seen in console, you can view them by opening the debug.log file. Example command line strings from debug logs, for the main process and the renderer process:
# Main process
python --browser-subprocess-path="C:\cefpython\cefpython\cef3\windows\binaries
/subprocess" --lang=en-US --log-file="C:\cefpython\cefpython\cef3\windows
\binaries\debug.log" --log-severity=info --enable-release-dcheck
--no-sandbox wxpython.py
# Renderer process
"C:\cefpython\cefpython\cef3\windows\binaries/subprocess" --type=renderer
--no-sandbox --lang=en-US --lang=en-US --log-file="C:\cefpython\cefpython\
cef3\windows\binaries\debug.log" --log-severity=info --enable-release-dcheck
--channel="4152.0.209609692\1183564454" /prefetch:673131151

Example switches
enable-media-stream
To enable media (WebRTC audio/video) streaming set the "enable-media-stream" CEF switch. This will enable the getUserMedia function in javascript.
proxy-server
To set custom proxy set the "proxy-server" Chromium switch to "socks5://127.0.0.1:8888" for example. See also Proxy Resolution page.
no-proxy-server
By default Chromium uses the IE proxy settings (set in Internet Explorer options), to disable that set the "no-proxy-server" Chromium switch. See also Proxy Resolution page.
disable-gpu
Disable GPU rendering and switch to CPU software rendering. This flag can fix the black/white browser screen issue.
Chromium switches by category
The peter.sh website should list all Chromium switches that are assembled from many Chromium files. Though, some switches may be missing there. Here is a list (in some way categorized) of all Chromium source files that define switches (list assembled on January 16, 2014):