browserenginekit

Name: browserenginekit
Author: dpearson2699

915stars45forks

How to install browserenginekit?

dpearson2699/swift-ios-skills/browserenginekit

$npx -y skills add dpearson2699/swift-ios-skills --skill browserenginekit

Installs into the current project.

Summary

Build alternative browser engines using BrowserEngineKit. Use when developing a non-WebKit browser engine for iOS/iPadOS in supported regions, managing web content/rendering/networking extension processes, configuring GPU and networking process capabilities, checking alternative-

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SKILL.md

1	# BrowserEngineKit
2
3	Framework for building web browsers with alternative (non-WebKit) rendering
4	engines on iOS and iPadOS. Provides process isolation, XPC communication,
5	capability management, and system integration for browser apps that implement
6	their own HTML/CSS/JavaScript engine. Examples target Swift 6.3 and current
7	Apple SDKs.
8
9	BrowserEngineKit is a specialized framework. Alternative browser engines are
10	available only through Apple-approved entitlement profiles and supported-region
11	device eligibility. EU support applies to eligible users on iOS 17.4+ and
12	iPadOS 18+; Japan support starts with iOS 26.2 and adds explicit PAC/MIE
13	security requirements for browser apps. Development and testing can occur
14	anywhere. The companion frameworks BrowserEngineCore (low-level primitives) and
15	BrowserKit (eligibility checks, data transfer) support the overall workflow.
16
17	## Contents
18	- [Overview and Eligibility](#overview-and-eligibility)
19	- [Entitlements](#entitlements)
20	- [Architecture](#architecture)
21	- [Process Management](#process-management)
22	- [Extension Types](#extension-types)
23	- [Capabilities](#capabilities)
24	- [Layer Hosting and View Coordination](#layer-hosting-and-view-coordination)
25	- [Text Interaction](#text-interaction)
26	- [Sandbox and Security](#sandbox-and-security)
27	- [Downloads](#downloads)
28	- [Common Mistakes](#common-mistakes)
29	- [Review Checklist](#review-checklist)
30	- [References](#references)
31
32	## Overview and Eligibility
33
34	### Eligibility Checking
35
36	Use `BEAvailability` from the BrowserKit framework to check whether the device
37	is eligible for alternative browser engines. `BEAvailability` is available on
38	iOS/iPadOS 18.4+:
39
40	```swift
41	import BrowserKit
42
43	do {
44	let eligible = try await BEAvailability.isEligible(for: .webBrowser)
45	guard eligible else { return /* fall back or explain */ }
46	// Device supports alternative browser engines
47	} catch {
48	// Handle eligibility lookup failure
49	}
50	```
51
52	Eligibility depends on the device region and OS version. Do not hard-code
53	region checks; rely on the system API.
54
55	Availability anchors: process APIs are iOS/iPadOS 17.4+, `BEDownloadMonitor`
56	is iOS 18.2+, `.revision2` restricted sandbox is iOS 26+, and
57	`RenderingExtensionFeature.coreML` is iOS 26.2+.
58
59	## Entitlements
60
61	### Browser App (Host)
62
63	The host app requires two entitlements:
64
65	\| Entitlement \| Purpose \|
66	\|---\|---\|
67	\| `com.apple.developer.web-browser` \| Enables default-browser candidacy \|
68	\| `com.apple.developer.web-browser-engine.host` \| Enables alternative engine extensions \|
69
70	Both must be requested from Apple. The request process varies by region.
71
72	### Extension Entitlements
73
74	Each extension target requires its type-specific entitlement set to `true`:
75
76	\| Extension Type \| Entitlement \|
77	\|---\|---\|
78	\| Web content \| `com.apple.developer.web-browser-engine.webcontent` \|
79	\| Networking \| `com.apple.developer.web-browser-engine.networking` \|
80	\| Rendering \| `com.apple.developer.web-browser-engine.rendering` \|
81
82	### Optional Entitlements
83
84	\| Entitlement \| Extension \| Purpose \|
85	\|---\|---\|---\|
86	\| `com.apple.security.cs.allow-jit` \| Web content \| JIT compilation of scripts \|
87	\| `com.apple.developer.kernel.extended-virtual-addressing` \| Web content \| Required alongside JIT \|
88	\| `com.apple.developer.memory.transfer_send` \| Rendering \| Send memory attribution; value is host app bundle ID \|
89	\| `com.apple.developer.memory.transfer_accept` \| Web content \| Accept memory attribution; value is host app bundle ID \|
90	\| `com.apple.developer.web-browser-engine.restrict.notifyd` \| Web content \| Restrict notification daemon access \|
91
92	### Embedded Browser Engine (Non-Browser Apps)
93
94	Apps that are not browsers but embed an alternative engine for in-app browsing
95	use different entitlements:
96
97	\| Entitlement \| Purpose \|
98	\|---\|---\|
99	\| `com.apple.developer.embedded-web-browser-engine` \| Enable embedded engine \|
100	\| `com.apple.developer.embedded-web-browser-engine.engine-association` \| Declare engine ownership \|
101
102	`engine-association` is available starting iOS/iPadOS/Mac Catalyst 26.2 and is
103	set to `first-party` when you own the engine or `third-party` when another
104	developer owns it. Embedded engines use `arm64` only (not `arm64e`), cannot
105	include browser extensions, and cannot use JIT compilation.
106
107	### Japan-Specific Requirements
108
109	Browser apps distributed in Japan are supported on iOS 26.2+ and must adopt the
110	current security mitigations Apple lists for Japan, including Pointer
111	Authentication Codes and Memory Integrity Enforcement for relevant allocators
112	and extension processes. Enable hardware memory tagging with
113	`com.apple.security.hardened-process.checked-a

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browserenginekit

915stars45forks

View on GitHub

How to install browserenginekit?

dpearson2699/swift-ios-skills/browserenginekit

$npx -y skills add dpearson2699/swift-ios-skills --skill browserenginekit

Installs into the current project.

Summary

Files · 1

View on GitHub

SKILL.md

1	# BrowserEngineKit
2
3	Framework for building web browsers with alternative (non-WebKit) rendering
4	engines on iOS and iPadOS. Provides process isolation, XPC communication,
5	capability management, and system integration for browser apps that implement
6	their own HTML/CSS/JavaScript engine. Examples target Swift 6.3 and current
7	Apple SDKs.
8
9	BrowserEngineKit is a specialized framework. Alternative browser engines are
10	available only through Apple-approved entitlement profiles and supported-region
11	device eligibility. EU support applies to eligible users on iOS 17.4+ and
12	iPadOS 18+; Japan support starts with iOS 26.2 and adds explicit PAC/MIE
13	security requirements for browser apps. Development and testing can occur
14	anywhere. The companion frameworks BrowserEngineCore (low-level primitives) and
15	BrowserKit (eligibility checks, data transfer) support the overall workflow.
16
17	## Contents
18	- [Overview and Eligibility](#overview-and-eligibility)
19	- [Entitlements](#entitlements)
20	- [Architecture](#architecture)
21	- [Process Management](#process-management)
22	- [Extension Types](#extension-types)
23	- [Capabilities](#capabilities)
24	- [Layer Hosting and View Coordination](#layer-hosting-and-view-coordination)
25	- [Text Interaction](#text-interaction)
26	- [Sandbox and Security](#sandbox-and-security)
27	- [Downloads](#downloads)
28	- [Common Mistakes](#common-mistakes)
29	- [Review Checklist](#review-checklist)
30	- [References](#references)
31
32	## Overview and Eligibility
33
34	### Eligibility Checking
35
36	Use `BEAvailability` from the BrowserKit framework to check whether the device
37	is eligible for alternative browser engines. `BEAvailability` is available on
38	iOS/iPadOS 18.4+:
39
40	```swift
41	import BrowserKit
42
43	do {
44	let eligible = try await BEAvailability.isEligible(for: .webBrowser)
45	guard eligible else { return /* fall back or explain */ }
46	// Device supports alternative browser engines
47	} catch {
48	// Handle eligibility lookup failure
49	}
50	```
51
52	Eligibility depends on the device region and OS version. Do not hard-code
53	region checks; rely on the system API.
54
55	Availability anchors: process APIs are iOS/iPadOS 17.4+, `BEDownloadMonitor`
56	is iOS 18.2+, `.revision2` restricted sandbox is iOS 26+, and
57	`RenderingExtensionFeature.coreML` is iOS 26.2+.
58
59	## Entitlements
60
61	### Browser App (Host)
62
63	The host app requires two entitlements:
64
65	\| Entitlement \| Purpose \|
66	\|---\|---\|
67	\| `com.apple.developer.web-browser` \| Enables default-browser candidacy \|
68	\| `com.apple.developer.web-browser-engine.host` \| Enables alternative engine extensions \|
69
70	Both must be requested from Apple. The request process varies by region.
71
72	### Extension Entitlements
73
74	Each extension target requires its type-specific entitlement set to `true`:
75
76	\| Extension Type \| Entitlement \|
77	\|---\|---\|
78	\| Web content \| `com.apple.developer.web-browser-engine.webcontent` \|
79	\| Networking \| `com.apple.developer.web-browser-engine.networking` \|
80	\| Rendering \| `com.apple.developer.web-browser-engine.rendering` \|
81
82	### Optional Entitlements
83
84	\| Entitlement \| Extension \| Purpose \|
85	\|---\|---\|---\|
86	\| `com.apple.security.cs.allow-jit` \| Web content \| JIT compilation of scripts \|
87	\| `com.apple.developer.kernel.extended-virtual-addressing` \| Web content \| Required alongside JIT \|
88	\| `com.apple.developer.memory.transfer_send` \| Rendering \| Send memory attribution; value is host app bundle ID \|
89	\| `com.apple.developer.memory.transfer_accept` \| Web content \| Accept memory attribution; value is host app bundle ID \|
90	\| `com.apple.developer.web-browser-engine.restrict.notifyd` \| Web content \| Restrict notification daemon access \|
91
92	### Embedded Browser Engine (Non-Browser Apps)
93
94	Apps that are not browsers but embed an alternative engine for in-app browsing
95	use different entitlements:
96
97	\| Entitlement \| Purpose \|
98	\|---\|---\|
99	\| `com.apple.developer.embedded-web-browser-engine` \| Enable embedded engine \|
100	\| `com.apple.developer.embedded-web-browser-engine.engine-association` \| Declare engine ownership \|
101
102	`engine-association` is available starting iOS/iPadOS/Mac Catalyst 26.2 and is
103	set to `first-party` when you own the engine or `third-party` when another
104	developer owns it. Embedded engines use `arm64` only (not `arm64e`), cannot
105	include browser extensions, and cannot use JIT compilation.
106
107	### Japan-Specific Requirements
108
109	Browser apps distributed in Japan are supported on iOS 26.2+ and must adopt the
110	current security mitigations Apple lists for Japan, including Pointer
111	Authentication Codes and Memory Integrity Enforcement for relevant allocators
112	and extension processes. Enable hardware memory tagging with
113	`com.apple.security.hardened-process.checked-a

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