Broaden Android accessibility autofill fallback

androidsrc/org/julianfamily/keepassgo/AutofillCacheStore.java

@@ -25,26 +25,7 @@ final class AutofillCacheStore {
         if (entries.isEmpty()) {
             return null;
         }
-        NormalizedTarget target = normalizeURL(webDomain);
+        return fromMatcherEntry(AutofillTargetMatcher.findBestMatch(toMatcherEntries(entries), webDomain));
-        if (target.host.isEmpty()) {
-            return null;
-        }
-        List<Entry> exactHost = new ArrayList<>();
-        List<Entry> parentHost = new ArrayList<>();
-        for (Entry entry : entries) {
-            if (entryMatchesHost(entry, target.host)) {
-                exactHost.add(entry);
-                continue;
-            }
-            if (entryMatchesParentHost(entry, target.host)) {
-                parentHost.add(entry);
-            }
-        }
-        Entry matched = chooseEntry(target, exactHost);
-        if (matched != null) {
-            return matched;
-        }
-        return chooseEntry(target, parentHost);
     }
 
     static Entry findByID(Context context, String entryID) {
@@ -64,7 +45,7 @@ final class AutofillCacheStore {
         if (entries.isEmpty()) {
             return entries;
         }
-        Entry direct = findBestMatch(context, rawTarget);
+        Entry direct = fromMatcherEntry(AutofillTargetMatcher.findBestMatch(toMatcherEntries(entries), rawTarget));
         if (direct != null) {
             List<Entry> resolved = new ArrayList<>();
             resolved.add(direct);
@@ -77,6 +58,30 @@ final class AutofillCacheStore {
         return entries;
     }
 
+    private static List<AutofillTargetMatcher.Entry> toMatcherEntries(List<Entry> entries) {
+        List<AutofillTargetMatcher.Entry> converted = new ArrayList<>(entries.size());
+        for (Entry entry : entries) {
+            converted.add(new AutofillTargetMatcher.Entry(
+                    entry.id,
+                    entry.title,
+                    entry.username,
+                    entry.password,
+                    entry.host,
+                    entry.url,
+                    entry.targets,
+                    entry.path
+            ));
+        }
+        return converted;
+    }
+
+    private static Entry fromMatcherEntry(AutofillTargetMatcher.Entry entry) {
+        if (entry == null) {
+            return null;
+        }
+        return new Entry(entry.id, entry.title, entry.username, entry.password, entry.host, entry.url, entry.targets, entry.path);
+    }
+
     private static List<Entry> readEntries(Context context) {
         File cacheFile = findCacheFile(context);
         if (cacheFile == null) {
@@ -199,143 +204,7 @@ final class AutofillCacheStore {
     }
 
     private static String normalizeHost(String raw) {
-        return normalizeURL(raw).host;
+        return AutofillTargetMatcher.normalize(raw).host;
-    }
-
-    private static NormalizedTarget normalizeURL(String raw) {
-        if (raw == null) {
-            return new NormalizedTarget("", "", "");
-        }
-        String value = raw.trim().toLowerCase(Locale.US);
-        if (value.startsWith("http://")) {
-            value = value.substring("http://".length());
-        } else if (value.startsWith("https://")) {
-            value = value.substring("https://".length());
-        }
-        int slash = value.indexOf('/');
-        if (slash >= 0) {
-            value = value.substring(0, slash);
-        }
-        int colon = value.indexOf(':');
-        if (colon >= 0) {
-            value = value.substring(0, colon);
-        }
-        String host = value;
-        String path = "/";
-        int schemeSep = raw.indexOf("://");
-        String original = raw.trim();
-        if (schemeSep < 0) {
-            original = "https://" + original;
-        }
-        try {
-            java.net.URI uri = java.net.URI.create(original);
-            if (uri.getHost() != null) {
-                host = uri.getHost().toLowerCase(Locale.US);
-            }
-            path = cleanPath(uri.getPath());
-        } catch (IllegalArgumentException ignored) {
-            path = "/";
-        }
-        return new NormalizedTarget(host, path, host + path);
-    }
-
-    private static String cleanPath(String raw) {
-        if (raw == null || raw.trim().isEmpty() || "/".equals(raw.trim())) {
-            return "/";
-        }
-        String value = raw.trim();
-        while (value.endsWith("/") && value.length() > 1) {
-            value = value.substring(0, value.length() - 1);
-        }
-        if (!value.startsWith("/")) {
-            value = "/" + value;
-        }
-        return value;
-    }
-
-    private static Entry chooseEntry(NormalizedTarget target, List<Entry> entries) {
-        if (entries.isEmpty()) {
-            return null;
-        }
-        if (entries.size() == 1) {
-            return entries.get(0);
-        }
-
-        List<Entry> exact = new ArrayList<>();
-        List<Entry> prefix = new ArrayList<>();
-        int bestPrefixLen = -1;
-        for (Entry entry : entries) {
-            MatchQuality quality = bestTargetMatch(entry, target);
-            if (quality.exact) {
-                exact.add(entry);
-                continue;
-            }
-            if (quality.prefixLength <= 0) {
-                continue;
-            }
-            if (quality.prefixLength > bestPrefixLen) {
-                prefix.clear();
-                prefix.add(entry);
-                bestPrefixLen = quality.prefixLength;
-            } else if (quality.prefixLength == bestPrefixLen) {
-                prefix.add(entry);
-            }
-        }
-        if (exact.size() == 1) {
-            return exact.get(0);
-        }
-        if (exact.size() > 1 || prefix.isEmpty()) {
-            return null;
-        }
-
-        return prefix.size() == 1 ? prefix.get(0) : null;
-    }
-
-    private static boolean entryMatchesHost(Entry entry, String host) {
-        for (NormalizedTarget target : entryTargets(entry)) {
-            if (target.host.equals(host)) {
-                return true;
-            }
-        }
-        return false;
-    }
-
-    private static boolean entryMatchesParentHost(Entry entry, String host) {
-        for (NormalizedTarget target : entryTargets(entry)) {
-            if (!target.host.isEmpty() && host.endsWith("." + target.host)) {
-                return true;
-            }
-        }
-        return false;
-    }
-
-    private static List<NormalizedTarget> entryTargets(Entry entry) {
-        List<String> rawTargets = entry.targets;
-        if (rawTargets.isEmpty()) {
-            rawTargets = new ArrayList<>();
-            rawTargets.add(entry.url);
-        }
-        List<NormalizedTarget> targets = new ArrayList<>();
-        for (String rawTarget : rawTargets) {
-            NormalizedTarget target = normalizeURL(rawTarget);
-            if (!target.host.isEmpty()) {
-                targets.add(target);
-            }
-        }
-        return targets;
-    }
-
-    private static MatchQuality bestTargetMatch(Entry entry, NormalizedTarget target) {
-        int bestPrefixLen = -1;
-        for (NormalizedTarget entryTarget : entryTargets(entry)) {
-            if (entryTarget.url.equals(target.url)) {
-                return new MatchQuality(true, 0);
-            }
-            if (!"/".equals(entryTarget.path) && target.path.startsWith(entryTarget.path)) {
-                bestPrefixLen = Math.max(bestPrefixLen, entryTarget.path.length());
-            }
-        }
-        return new MatchQuality(false, bestPrefixLen);
     }
 
     static final class Entry {
@@ -359,26 +228,4 @@ final class AutofillCacheStore {
             this.path = new ArrayList<>(path);
         }
     }
-
-    private static final class MatchQuality {
-        final boolean exact;
-        final int prefixLength;
-
-        MatchQuality(boolean exact, int prefixLength) {
-            this.exact = exact;
-            this.prefixLength = prefixLength;
-        }
-    }
-
-    private static final class NormalizedTarget {
-        final String host;
-        final String path;
-        final String url;
-
-        NormalizedTarget(String host, String path, String url) {
-            this.host = host;
-            this.path = path;
-            this.url = url;
-        }
-    }
 }

androidsrc/org/julianfamily/keepassgo/AutofillFallbackTarget.java

@@ -0,0 +1,24 @@
+package org.julianfamily.keepassgo;
+
+final class AutofillFallbackTarget {
+    private static final String APP_SCHEME = "androidapp://";
+
+    private AutofillFallbackTarget() {
+    }
+
+    static String resolve(String packageName, String webDomain) {
+        String domain = trim(webDomain);
+        if (!domain.isEmpty()) {
+            return domain;
+        }
+        String pkg = trim(packageName);
+        if (pkg.isEmpty()) {
+            return "";
+        }
+        return APP_SCHEME + pkg;
+    }
+
+    private static String trim(String value) {
+        return value == null ? "" : value.trim();
+    }
+}

androidsrc/org/julianfamily/keepassgo/AutofillTargetMatcher.java

@@ -0,0 +1,232 @@
+package org.julianfamily.keepassgo;
+
+import java.net.URI;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Locale;
+
+final class AutofillTargetMatcher {
+    private AutofillTargetMatcher() {
+    }
+
+    static Entry findBestMatch(List<Entry> entries, String rawTarget) {
+        if (entries == null || entries.isEmpty()) {
+            return null;
+        }
+        NormalizedTarget target = normalize(rawTarget);
+        if (target.host.isEmpty()) {
+            return null;
+        }
+        List<Entry> exactHost = new ArrayList<>();
+        List<Entry> parentHost = new ArrayList<>();
+        for (Entry entry : entries) {
+            if (entryMatchesHost(entry, target.host)) {
+                exactHost.add(entry);
+                continue;
+            }
+            if (entryMatchesParentHost(entry, target.host)) {
+                parentHost.add(entry);
+            }
+        }
+        Entry matched = chooseEntry(target, exactHost);
+        if (matched != null) {
+            return matched;
+        }
+        return chooseEntry(target, parentHost);
+    }
+
+    static List<Entry> chooserCandidates(List<Entry> entries, String rawTarget) {
+        if (entries == null || entries.isEmpty()) {
+            return new ArrayList<>();
+        }
+        Entry direct = findBestMatch(entries, rawTarget);
+        if (direct != null) {
+            List<Entry> resolved = new ArrayList<>();
+            resolved.add(direct);
+            return resolved;
+        }
+        return new ArrayList<>(entries);
+    }
+
+    static NormalizedTarget normalize(String raw) {
+        if (raw == null) {
+            return new NormalizedTarget("", "", "");
+        }
+        String trimmed = raw.trim();
+        if (trimmed.isEmpty()) {
+            return new NormalizedTarget("", "", "");
+        }
+        String original = trimmed;
+        String value = trimmed.toLowerCase(Locale.US);
+        if (value.startsWith("http://")) {
+            value = value.substring("http://".length());
+        } else if (value.startsWith("https://")) {
+            value = value.substring("https://".length());
+        }
+        int slash = value.indexOf('/');
+        if (slash >= 0) {
+            value = value.substring(0, slash);
+        }
+        int colon = value.indexOf(':');
+        if (colon >= 0) {
+            value = value.substring(0, colon);
+        }
+        String host = value;
+        String path = "/";
+        int schemeSep = original.indexOf("://");
+        if (schemeSep < 0) {
+            original = "https://" + original;
+        }
+        try {
+            URI uri = URI.create(original);
+            if (uri.getHost() != null) {
+                host = uri.getHost().toLowerCase(Locale.US);
+            }
+            path = cleanPath(uri.getPath());
+        } catch (IllegalArgumentException ignored) {
+            path = "/";
+        }
+        return new NormalizedTarget(host, path, host + path);
+    }
+
+    private static String cleanPath(String raw) {
+        if (raw == null || raw.trim().isEmpty() || "/".equals(raw.trim())) {
+            return "/";
+        }
+        String value = raw.trim();
+        while (value.endsWith("/") && value.length() > 1) {
+            value = value.substring(0, value.length() - 1);
+        }
+        if (!value.startsWith("/")) {
+            value = "/" + value;
+        }
+        return value;
+    }
+
+    private static Entry chooseEntry(NormalizedTarget target, List<Entry> entries) {
+        if (entries.isEmpty()) {
+            return null;
+        }
+        if (entries.size() == 1) {
+            return entries.get(0);
+        }
+        List<Entry> exact = new ArrayList<>();
+        List<Entry> prefix = new ArrayList<>();
+        int bestPrefixLen = -1;
+        for (Entry entry : entries) {
+            MatchQuality quality = bestTargetMatch(entry, target);
+            if (quality.exact) {
+                exact.add(entry);
+                continue;
+            }
+            if (quality.prefixLength <= 0) {
+                continue;
+            }
+            if (quality.prefixLength > bestPrefixLen) {
+                prefix.clear();
+                prefix.add(entry);
+                bestPrefixLen = quality.prefixLength;
+            } else if (quality.prefixLength == bestPrefixLen) {
+                prefix.add(entry);
+            }
+        }
+        if (exact.size() == 1) {
+            return exact.get(0);
+        }
+        if (exact.size() > 1 || prefix.isEmpty()) {
+            return null;
+        }
+        return prefix.size() == 1 ? prefix.get(0) : null;
+    }
+
+    private static boolean entryMatchesHost(Entry entry, String host) {
+        for (NormalizedTarget target : entryTargets(entry)) {
+            if (target.host.equals(host)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private static boolean entryMatchesParentHost(Entry entry, String host) {
+        for (NormalizedTarget target : entryTargets(entry)) {
+            if (!target.host.isEmpty() && host.endsWith("." + target.host)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private static List<NormalizedTarget> entryTargets(Entry entry) {
+        List<String> rawTargets = entry.targets;
+        if (rawTargets.isEmpty()) {
+            rawTargets = new ArrayList<>();
+            rawTargets.add(entry.url);
+        }
+        List<NormalizedTarget> targets = new ArrayList<>();
+        for (String rawTarget : rawTargets) {
+            NormalizedTarget target = normalize(rawTarget);
+            if (!target.host.isEmpty()) {
+                targets.add(target);
+            }
+        }
+        return targets;
+    }
+
+    private static MatchQuality bestTargetMatch(Entry entry, NormalizedTarget target) {
+        int bestPrefixLen = -1;
+        for (NormalizedTarget entryTarget : entryTargets(entry)) {
+            if (entryTarget.url.equals(target.url)) {
+                return new MatchQuality(true, 0);
+            }
+            if (!"/".equals(entryTarget.path) && target.path.startsWith(entryTarget.path)) {
+                bestPrefixLen = Math.max(bestPrefixLen, entryTarget.path.length());
+            }
+        }
+        return new MatchQuality(false, bestPrefixLen);
+    }
+
+    static final class NormalizedTarget {
+        final String host;
+        final String path;
+        final String url;
+
+        NormalizedTarget(String host, String path, String url) {
+            this.host = host;
+            this.path = path;
+            this.url = url;
+        }
+    }
+
+    static final class Entry {
+        final String id;
+        final String title;
+        final String username;
+        final String password;
+        final String host;
+        final String url;
+        final List<String> targets;
+        final List<String> path;
+
+        Entry(String id, String title, String username, String password, String host, String url, List<String> targets, List<String> path) {
+            this.id = id;
+            this.title = title;
+            this.username = username;
+            this.password = password;
+            this.host = host;
+            this.url = url;
+            this.targets = new ArrayList<>(targets);
+            this.path = new ArrayList<>(path);
+        }
+    }
+
+    private static final class MatchQuality {
+        final boolean exact;
+        final int prefixLength;
+
+        MatchQuality(boolean exact, int prefixLength) {
+            this.exact = exact;
+            this.prefixLength = prefixLength;
+        }
+    }
+}

androidsrc/org/julianfamily/keepassgo/KeePassGOAccessibilityService.java

@@ -12,7 +12,6 @@ import java.util.List;
 
 public final class KeePassGOAccessibilityService extends AccessibilityService {
     private static final String TAG = "KeePassGOA11y";
-
     private String lastFilledSignature = "";
 
     @Override
@@ -22,22 +21,17 @@ public final class KeePassGOAccessibilityService extends AccessibilityService {
             if (root == null) {
                 return;
             }
-            CharSequence packageName = root.getPackageName();
+            ChromeForm form = inspectWindow(root);
-            if (packageName == null || !"com.android.chrome".contentEquals(packageName)) {
-                return;
-            }
-
-            ChromeForm form = inspectChrome(root);
             if (form == null || form.passwordField == null) {
                 return;
             }
-            AutofillCacheStore.Entry entry = AutofillCacheStore.findBestMatch(this, form.url);
+            AutofillCacheStore.Entry entry = AutofillCacheStore.findBestMatch(this, form.matchTarget);
             if (entry == null) {
-                Log.i(TAG, "no accessibility-fill match for " + form.url);
+                Log.i(TAG, "no accessibility-fill match for " + form.matchTarget);
                 return;
             }
 
-            String signature = form.url + "|" + entry.username + "|" + nodeKey(form.passwordField);
+            String signature = form.matchTarget + "|" + entry.username + "|" + nodeKey(form.passwordField);
             if (signature.equals(lastFilledSignature)) {
                 return;
             }
@@ -49,7 +43,7 @@ public final class KeePassGOAccessibilityService extends AccessibilityService {
             filled |= setNodeText(form.passwordField, entry.password);
             if (filled) {
                 lastFilledSignature = signature;
-                Log.i(TAG, "filled login form for " + form.url + " with " + entry.username);
+                Log.i(TAG, "filled login form for " + form.matchTarget + " with " + entry.username);
             }
         } catch (Exception err) {
             Log.e(TAG, "accessibility fill failed", err);
@@ -61,11 +55,11 @@ public final class KeePassGOAccessibilityService extends AccessibilityService {
         Log.i(TAG, "accessibility service interrupted");
     }
 
-    private static ChromeForm inspectChrome(AccessibilityNodeInfo root) {
+    private static ChromeForm inspectWindow(AccessibilityNodeInfo root) {
         List<AccessibilityNodeInfo> editables = new ArrayList<>();
         ChromeForm form = new ChromeForm();
         walk(root, editables, form);
-        if (form.url.isEmpty()) {
+        if (form.matchTarget.isEmpty()) {
             return null;
         }
         if (form.passwordField == null) {
@@ -111,7 +105,13 @@ public final class KeePassGOAccessibilityService extends AccessibilityService {
         if (viewID != null && viewID.toString().endsWith(":id/url_bar")) {
             CharSequence text = node.getText();
             if (text != null) {
-                form.url = text.toString().trim();
+                form.webDomain = text.toString().trim();
+            }
+        }
+        if (form.packageName.isEmpty()) {
+            CharSequence packageName = node.getPackageName();
+            if (packageName != null) {
+                form.packageName = packageName.toString().trim();
             }
         }
         if (node.isEditable()) {
@@ -128,6 +128,7 @@ public final class KeePassGOAccessibilityService extends AccessibilityService {
                 walk(child, editables, form);
             }
         }
+        form.matchTarget = AutofillFallbackTarget.resolve(form.packageName, form.webDomain);
     }
 
     private static boolean isPasswordNode(AccessibilityNodeInfo node) {
@@ -188,7 +189,9 @@ public final class KeePassGOAccessibilityService extends AccessibilityService {
     }
 
     private static final class ChromeForm {
-        String url = "";
+        String packageName = "";
+        String webDomain = "";
+        String matchTarget = "";
         AccessibilityNodeInfo usernameField;
         AccessibilityNodeInfo passwordField;
     }

androidtestsrc/org/julianfamily/keepassgo/AutofillCacheStoreBehaviorTest.java

@@ -0,0 +1,75 @@
+package org.julianfamily.keepassgo;
+
+import java.util.Arrays;
+import java.util.ArrayList;
+import java.util.List;
+
+public final class AutofillCacheStoreBehaviorTest {
+    public static void main(String[] args) {
+        testFindBestMatchUsesAndroidAppTargets();
+        testChooserCandidatesCollapseToExactAndroidAppMatch();
+    }
+
+    private static void testFindBestMatchUsesAndroidAppTargets() {
+        List<AutofillTargetMatcher.Entry> entries = new ArrayList<>();
+        entries.add(new AutofillTargetMatcher.Entry(
+                "blink-entry",
+                "Blink",
+                "linuscaldwell",
+                "bellagio-stack",
+                "account.blinknetwork.com",
+                "https://account.blinknetwork.com",
+                Arrays.asList("https://account.blinknetwork.com", "androidapp://com.blinknetwork.mobile2"),
+                Arrays.asList("Crew", "Apps")
+        ));
+
+        AutofillTargetMatcher.Entry got = AutofillTargetMatcher.findBestMatch(entries, "androidapp://com.blinknetwork.mobile2");
+        if (got == null || !"blink-entry".equals(got.id)) {
+            throw new AssertionError("findBestMatch(entries, androidapp target) = " + describe(got) + ", want blink-entry");
+        }
+    }
+
+    private static void testChooserCandidatesCollapseToExactAndroidAppMatch() {
+        List<AutofillTargetMatcher.Entry> entries = new ArrayList<>();
+        entries.add(new AutofillTargetMatcher.Entry(
+                "blink-entry",
+                "Blink",
+                "linuscaldwell",
+                "bellagio-stack",
+                "account.blinknetwork.com",
+                "https://account.blinknetwork.com",
+                Arrays.asList("https://account.blinknetwork.com", "androidapp://com.blinknetwork.mobile2"),
+                Arrays.asList("Crew", "Apps")
+        ));
+        entries.add(new AutofillTargetMatcher.Entry(
+                "night-fox-entry",
+                "Night Fox",
+                "nightfox",
+                "vault-code",
+                "gitlab.com",
+                "https://gitlab.com",
+                Arrays.asList("https://gitlab.com"),
+                Arrays.asList("Crew", "Internet")
+        ));
+
+        List<AutofillTargetMatcher.Entry> got = AutofillTargetMatcher.chooserCandidates(entries, "androidapp://com.blinknetwork.mobile2");
+        if (got.size() != 1 || !"blink-entry".equals(got.get(0).id)) {
+            throw new AssertionError("chooserCandidates(entries, androidapp target) = " + describe(got) + ", want [blink-entry]");
+        }
+    }
+
+    private static String describe(AutofillTargetMatcher.Entry entry) {
+        if (entry == null) {
+            return "null";
+        }
+        return entry.id;
+    }
+
+    private static String describe(List<AutofillTargetMatcher.Entry> entries) {
+        List<String> ids = new ArrayList<>();
+        for (AutofillTargetMatcher.Entry entry : entries) {
+            ids.add(entry.id);
+        }
+        return ids.toString();
+    }
+}

androidtestsrc/org/julianfamily/keepassgo/AutofillFallbackTargetBehaviorTest.java

@@ -0,0 +1,30 @@
+package org.julianfamily.keepassgo;
+
+public final class AutofillFallbackTargetBehaviorTest {
+    public static void main(String[] args) {
+        testPrefersWebDomainWhenPresent();
+        testFallsBackToAndroidAppPackage();
+        testEmptyWhenNeitherSignalExists();
+    }
+
+    private static void testPrefersWebDomainWhenPresent() {
+        String got = AutofillFallbackTarget.resolve("com.android.chrome", "gitlab.com");
+        if (!"gitlab.com".equals(got)) {
+            throw new AssertionError("resolve(chrome, gitlab.com) = " + got + ", want gitlab.com");
+        }
+    }
+
+    private static void testFallsBackToAndroidAppPackage() {
+        String got = AutofillFallbackTarget.resolve("com.blinknetwork.mobile2", "");
+        if (!"androidapp://com.blinknetwork.mobile2".equals(got)) {
+            throw new AssertionError("resolve(package-only) = " + got + ", want androidapp://com.blinknetwork.mobile2");
+        }
+    }
+
+    private static void testEmptyWhenNeitherSignalExists() {
+        String got = AutofillFallbackTarget.resolve("", "");
+        if (!"".equals(got)) {
+            throw new AssertionError("resolve(empty) = " + got + ", want empty");
+        }
+    }
+}

docs/android-autofill.md

@@ -0,0 +1,38 @@
+# Android Autofill
+
+## App Target Matching
+
+User story:
+
+- When an entry carries an Android-specific target such as
+  `androidapp://com.blinknetwork.mobile2`, KeePassGO should treat that as a
+  first-class autofill target on Android.
+- If an exact app target exists, Android autofill should resolve that entry
+  directly instead of falling back to a generic chooser for the whole cache.
+
+Expected behavior:
+
+- `AndroidApp*` custom fields exported into the autofill cache must match the
+  Android package target used by the autofill and accessibility services.
+- The Android-side matcher must normalize `androidapp://...` targets the same
+  way the Go cache builder does.
+- The chooser path should still collapse to a single direct result when there
+  is one exact app-target match.
+
+## Accessibility Fallback
+
+User story:
+
+- When Android accessibility fallback is needed, KeePassGO should not be
+  limited to Chrome-only URL bar parsing.
+- Apps with stable package identities should still be fillable when an entry
+  carries a matching `AndroidApp*` target.
+
+Expected behavior:
+
+- Accessibility fallback derives its match target from the web domain when one
+  is available.
+- If no web domain is available, accessibility fallback uses the active app
+  package as `androidapp://<package>`.
+- The fallback path can therefore fill supported apps that never expose a
+  browser-style URL bar.