WKPreferencesMBS.crossOriginResourcePolicyEnabled as Boolean

Var w As WKPreferencesMBS = HTMLViewer1.WKWebViewMBS.Preferences

w.crossOriginResourcePolicyEnabled = False

Disabling some cross policy checks may allow JavaScript to access a website loaded in a frame.

Default is true.

This property is included in the WebKit project, but not documented by Apple, so use with care and be aware that it may break in future (or gets officially documented in a future version of macOS).
(Read and Write property)

WKPreferencesMBS.defaultFontSize as Integer

HTMLViewer1.WKWebView.Preferences.defaultFontSize = 10

(Read and Write property)

Some examples using this property:

• /Mac64bit/WebKit2/HTMLViewer Save As PDF

WKPreferencesMBS.developerExtrasEnabled as Boolean

HTMLViewer1.WKWebView.Preferences.developerExtrasEnabled = true

Set to true, so you can inspect elements via contextual menus.

This property is included in the WebKit project, but not documented by Apple, so use with care and be aware that it may break in future (or gets officially documented in a future version of macOS).
(Read and Write property)

WKPreferencesMBS.ElementFullscreenEnabled as Boolean

The default value for this preference is false.
Requires macOS 12.3 or newer.
(Read and Write property)

WKPreferencesMBS.FraudulentWebsiteWarningEnabled as Boolean

The default value is true. This feature is currently available in the following region: China.
(Read and Write property)

WKPreferencesMBS.fullScreenEnabled as Boolean

Var w As WKPreferencesMBS = HTMLViewer1.WKWebViewMBS.Preferences
w.fullScreenEnabled = true

Default is false.

This property is included in the WebKit project, but not documented by Apple, so use with care and be aware that it may break in future (or gets officially documented in a future version of macOS).
(Read and Write property)

WKPreferencesMBS.Handle as Integer

(Read only property)

WKPreferencesMBS.javaEnabled as Boolean

WKWebViewControlMBS1.WKWebView.Preferences.javaEnabled = False

The default value is false.
Deprecated for macOS 10.15.
(Read and Write property)

WKPreferencesMBS.javaScriptCanOpenWindowsAutomatically as Boolean

WKWebViewControlMBS1.WKWebView.Preferences.javaScriptCanOpenWindowsAutomatically = False

The default value is false in iOS and true in macOS.
(Read and Write property)

WKPreferencesMBS.javaScriptEnabled as Boolean

WKWebViewControlMBS1.WKWebView.Preferences.javaScriptEnabled = False

The default value is true. Setting this property to false disables JavaScripts that are loaded or executed by the web page. This setting does not affect user scripts. See WKUserScriptMBS class.
(Read and Write property)

WKPreferencesMBS.loadsImagesAutomatically as Boolean

HTMLViewer1.WKWebView.Preferences.loadsImagesAutomatically = False

(Read and Write property)

WKPreferencesMBS.logsPageMessagesToSystemConsoleEnabled as Boolean

Var w As WKPreferencesMBS = HTMLViewer1.WKWebViewMBS.Preferences
w.logsPageMessagesToSystemConsoleEnabled = true

Default is false.

This property is included in the WebKit project, but not documented by Apple, so use with care and be aware that it may break in future (or gets officially documented in a future version of macOS).
(Read and Write property)

WKPreferencesMBS.mediaDevicesEnabled as Boolean

Var w As WKPreferencesMBS = HTMLViewer1.WKWebViewMBS.Preferences
w.mediaDevicesEnabled = true
w.mediaStreamEnabled = true

Default is false.

You may need to enable mediaStreamEnabled and mediaDevicesEnabled together to allow WebRTC. Also you need permissions to access camera and microphone via AVFoundation functions.

This property is included in the WebKit project, but not documented by Apple, so use with care and be aware that it may break in future (or gets officially documented in a future version of macOS).
(Read and Write property)

WKPreferencesMBS.mediaStreamEnabled as Boolean

Var w As WKPreferencesMBS = HTMLViewer1.WKWebViewMBS.Preferences
w.mediaDevicesEnabled = true
w.mediaStreamEnabled = true

Default is false.

You may need to enable mediaStreamEnabled and mediaDevicesEnabled together to allow WebRTC. Also you need permissions to access camera and microphone via AVFoundation functions.

This property is included in the WebKit project, but not documented by Apple, so use with care and be aware that it may break in future (or gets officially documented in a future version of macOS).
(Read and Write property)

WKPreferencesMBS.minimumFontSize as Double

WKWebViewControlMBS1.WKWebView.Preferences.minimumFontSize = 20

The default value is 0.
(Read and Write property)

WKPreferencesMBS.plugInsEnabled as Boolean

WKWebViewControlMBS1.WKWebView.Preferences.plugInsEnabled = False

The default value is false.
Deprecated for macOS 10.15.
(Read and Write property)

WKPreferencesMBS.shouldPrintBackgrounds as Boolean

HTMLViewer1.WKWebView.Preferences.shouldPrintBackgrounds = False

(Read and Write property)

WKPreferencesMBS.siteSpecificQuirksModeEnabled as Boolean

The default value for this preference is true.
Requires macOS 12.3 or newer.
(Read and Write property)

WKPreferencesMBS.standardFontFamily as String

(Read and Write property)

WKPreferencesMBS.tabFocusesLinks as Boolean

The Option key temporarily reverses this preference.
(Read and Write property)

WKPreferencesMBS.telephoneNumberDetectionIsEnabled as Boolean

Var w As WKPreferencesMBS = HTMLViewer1.WKWebViewMBS.Preferences

w.telephoneNumberDetectionIsEnabled = True

Default is false.

This property is included in the WebKit project, but not documented by Apple, so use with care and be aware that it may break in future (or gets officially documented in a future version of macOS).
(Read and Write property)

WKPreferencesMBS.TextInteractionEnabled as Boolean

Requires macOS 12.0 or iOS 15.0 or newer.
(Read and Write property)

WKPreferencesMBS.webSecurityEnabled as Boolean

Var w As WKPreferencesMBS = HTMLViewer1.WKWebViewMBS.Preferences
w.webSecurityEnabled = False

Default is true.

This property is included in the WebKit project, but not documented by Apple, so use with care and be aware that it may break in future (or gets officially documented in a future version of macOS).
(Read and Write property)