More MutationObserver options, Performance API

build.zig.zon

@@ -5,8 +5,8 @@
     .fingerprint = 0xda130f3af836cea0,
     .dependencies = .{
         .v8 = .{
-            .url = "https://github.com/lightpanda-io/zig-v8-fork/archive/3aa2b39cb1ab588b85970beef5b374effccf1415.tar.gz",
+            .url = "https://github.com/lightpanda-io/zig-v8-fork/archive/beb187f3337a8c458e1917dc0105003fb7ae1b2f.tar.gz",
-            .hash = "v8-0.0.0-xddH66TeAwDDEs3QkHFlukxqqrRXITzzmmIn2NHISHCn",
+            .hash = "v8-0.0.0-xddH6x_gAwAgDtdWGHjv52NsW07MQnfpUQDpZn7RR43Y",
         },
         // .v8 = .{ .path = "../zig-v8-fork" }
     },

src/Scheduler.zig

@@ -74,6 +74,7 @@ fn runQueue(self: *Scheduler, queue: *Queue) !?u64 {
 
     const now = timestamp(.monotonic);
 
+    std.debug.print("running: {s}\n", .{task.name});
     while (queue.peek()) |*task_| {
         if (task_.run_at > now) {
             return @intCast(task_.run_at - now);

src/browser/Factory.zig

@@ -45,7 +45,6 @@ const MemoryPoolAligned = std.heap.MemoryPoolAligned;
 // (and alignment) based pools.
 const Factory = @This();
 _page: *Page,
-_size_1_8: MemoryPoolAligned([1]u8, .@"8"),
 _size_8_8: MemoryPoolAligned([8]u8, .@"8"),
 _size_16_8: MemoryPoolAligned([16]u8, .@"8"),
 _size_24_8: MemoryPoolAligned([24]u8, .@"8"),
@@ -55,24 +54,18 @@ _size_40_8: MemoryPoolAligned([40]u8, .@"8"),
 _size_48_16: MemoryPoolAligned([48]u8, .@"16"),
 _size_56_8: MemoryPoolAligned([56]u8, .@"8"),
 _size_64_16: MemoryPoolAligned([64]u8, .@"16"),
-_size_72_8: MemoryPoolAligned([72]u8, .@"8"),
 _size_80_16: MemoryPoolAligned([80]u8, .@"16"),
 _size_88_8: MemoryPoolAligned([88]u8, .@"8"),
 _size_96_16: MemoryPoolAligned([96]u8, .@"16"),
-_size_104_8: MemoryPoolAligned([104]u8, .@"8"),
-_size_112_8: MemoryPoolAligned([112]u8, .@"8"),
-_size_120_8: MemoryPoolAligned([120]u8, .@"8"),
 _size_128_8: MemoryPoolAligned([128]u8, .@"8"),
 _size_144_8: MemoryPoolAligned([144]u8, .@"8"),
 _size_152_8: MemoryPoolAligned([152]u8, .@"8"),
-_size_456_8: MemoryPoolAligned([456]u8, .@"8"),
+_size_160_8: MemoryPoolAligned([160]u8, .@"8"),
-_size_520_8: MemoryPoolAligned([520]u8, .@"8"),
 _size_648_8: MemoryPoolAligned([648]u8, .@"8"),
 
 pub fn init(page: *Page) Factory {
     return .{
         ._page = page,
-        ._size_1_8 = MemoryPoolAligned([1]u8, .@"8").init(page.arena),
         ._size_8_8 = MemoryPoolAligned([8]u8, .@"8").init(page.arena),
         ._size_16_8 = MemoryPoolAligned([16]u8, .@"8").init(page.arena),
         ._size_24_8 = MemoryPoolAligned([24]u8, .@"8").init(page.arena),
@@ -82,18 +75,13 @@ pub fn init(page: *Page) Factory {
         ._size_48_16 = MemoryPoolAligned([48]u8, .@"16").init(page.arena),
         ._size_56_8 = MemoryPoolAligned([56]u8, .@"8").init(page.arena),
         ._size_64_16 = MemoryPoolAligned([64]u8, .@"16").init(page.arena),
-        ._size_72_8 = MemoryPoolAligned([72]u8, .@"8").init(page.arena),
         ._size_80_16 = MemoryPoolAligned([80]u8, .@"16").init(page.arena),
         ._size_88_8 = MemoryPoolAligned([88]u8, .@"8").init(page.arena),
         ._size_96_16 = MemoryPoolAligned([96]u8, .@"16").init(page.arena),
-        ._size_104_8 = MemoryPoolAligned([104]u8, .@"8").init(page.arena),
-        ._size_112_8 = MemoryPoolAligned([112]u8, .@"8").init(page.arena),
-        ._size_120_8 = MemoryPoolAligned([120]u8, .@"8").init(page.arena),
         ._size_128_8 = MemoryPoolAligned([128]u8, .@"8").init(page.arena),
         ._size_144_8 = MemoryPoolAligned([144]u8, .@"8").init(page.arena),
         ._size_152_8 = MemoryPoolAligned([152]u8, .@"8").init(page.arena),
-        ._size_456_8 = MemoryPoolAligned([456]u8, .@"8").init(page.arena),
+        ._size_160_8 = MemoryPoolAligned([160]u8, .@"8").init(page.arena),
-        ._size_520_8 = MemoryPoolAligned([520]u8, .@"8").init(page.arena),
         ._size_648_8 = MemoryPoolAligned([648]u8, .@"8").init(page.arena),
     };
 }
@@ -230,7 +218,6 @@ pub fn create(self: *Factory, value: anytype) !*@TypeOf(value) {
 
 pub fn createT(self: *Factory, comptime T: type) !*T {
     const SO = @sizeOf(T);
-    if (comptime SO == 1) return @ptrCast(try self._size_1_8.create());
     if (comptime SO == 8) return @ptrCast(try self._size_8_8.create());
     if (comptime SO == 16) return @ptrCast(try self._size_16_8.create());
     if (comptime SO == 24) return @ptrCast(try self._size_24_8.create());
@@ -242,18 +229,12 @@ pub fn createT(self: *Factory, comptime T: type) !*T {
     if (comptime SO == 48) return @ptrCast(try self._size_48_16.create());
     if (comptime SO == 56) return @ptrCast(try self._size_56_8.create());
     if (comptime SO == 64) return @ptrCast(try self._size_64_16.create());
-    if (comptime SO == 72) return @ptrCast(try self._size_72_8.create());
     if (comptime SO == 80) return @ptrCast(try self._size_80_16.create());
     if (comptime SO == 88) return @ptrCast(try self._size_88_8.create());
     if (comptime SO == 96) return @ptrCast(try self._size_96_16.create());
-    if (comptime SO == 104) return @ptrCast(try self._size_104_8.create());
-    if (comptime SO == 112) return @ptrCast(try self._size_112_8.create());
-    if (comptime SO == 120) return @ptrCast(try self._size_120_8.create());
     if (comptime SO == 128) return @ptrCast(try self._size_128_8.create());
-    if (comptime SO == 144) return @ptrCast(try self._size_144_8.create());
     if (comptime SO == 152) return @ptrCast(try self._size_152_8.create());
-    if (comptime SO == 456) return @ptrCast(try self._size_456_8.create());
+    if (comptime SO == 160) return @ptrCast(try self._size_160_8.create());
-    if (comptime SO == 520) return @ptrCast(try self._size_520_8.create());
     if (comptime SO == 648) return @ptrCast(try self._size_648_8.create());
     @compileError(std.fmt.comptimePrint("No pool configured for @sizeOf({d}), @alignOf({d}): ({s})", .{ SO, @alignOf(T), @typeName(T) }));
 }
@@ -308,7 +289,6 @@ fn destroyChain(self: *Factory, value: anytype, comptime first: bool) void {
     // be (cannot be) freed. But we'll still free the chain.
     if (comptime wasAllocated(S)) {
         switch (@sizeOf(S)) {
-            1 => self._size_1_8.destroy(@ptrCast(@alignCast(value))),
             8 => self._size_8_8.destroy(@ptrCast(@alignCast(value))),
             16 => self._size_16_8.destroy(@ptrCast(value)),
             24 => self._size_24_8.destroy(@ptrCast(value)),
@@ -323,18 +303,13 @@ fn destroyChain(self: *Factory, value: anytype, comptime first: bool) void {
             48 => self._size_48_16.destroy(@ptrCast(@alignCast(value))),
             56 => self._size_56_8.destroy(@ptrCast(value)),
             64 => self._size_64_16.destroy(@ptrCast(@alignCast(value))),
-            72 => self._size_72_8.destroy(@ptrCast(@alignCast(value))),
             80 => self._size_80_16.destroy(@ptrCast(@alignCast(value))),
             88 => self._size_88_8.destroy(@ptrCast(@alignCast(value))),
             96 => self._size_96_16.destroy(@ptrCast(@alignCast(value))),
-            104 => self._size_104_8.destroy(@ptrCast(value)),
-            112 => self._size_112_8.destroy(@ptrCast(value)),
-            120 => self._size_120_8.destroy(@ptrCast(value)),
             128 => self._size_128_8.destroy(@ptrCast(value)),
             144 => self._size_144_8.destroy(@ptrCast(value)),
             152 => self._size_152_8.destroy(@ptrCast(value)),
-            456 => self._size_456_8.destroy(@ptrCast(value)),
+            160 => self._size_160_8.destroy(@ptrCast(value)),
-            520 => self._size_520_8.destroy(@ptrCast(value)),
             648 => self._size_648_8.destroy(@ptrCast(value)),
             else => |SO| @compileError(std.fmt.comptimePrint("Don't know what I'm being asked to destroy @sizeOf({d}), @alignOf({d}): ({s})", .{ SO, @alignOf(S), @typeName(S) })),
         }

src/browser/Page.zig

@@ -50,6 +50,7 @@ const Element = @import("webapi/Element.zig");
 const Window = @import("webapi/Window.zig");
 const Location = @import("webapi/Location.zig");
 const Document = @import("webapi/Document.zig");
+const Performance = @import("webapi/Performance.zig");
 const HtmlScript = @import("webapi/Element.zig").Html.Script;
 const MutationObserver = @import("webapi/MutationObserver.zig");
 const IntersectionObserver = @import("webapi/IntersectionObserver.zig");
@@ -179,6 +180,7 @@ fn reset(self: *Page, comptime initializing: bool) !void {
         ._document = self.document,
         ._storage_bucket = storage_bucket,
         ._history = History.init(self),
+        ._performance = Performance.init(),
         ._proto = undefined,
         ._location = &default_location,
     });
@@ -624,7 +626,7 @@ fn _wait(self: *Page, wait_ms: u32) !Session.WaitResult {
                             // Look, we want to exit ASAP, but we don't want
                             // to exit so fast that we've run none of the
                             // background jobs.
-                            break :blk if (comptime builtin.is_test) 5 else 50;
+                            break :blk if (comptime builtin.is_test) 1 else 50;
                         }
                         // No http transfers, no cdp extra socket, no
                         // scheduled tasks, we're done.
@@ -680,6 +682,13 @@ fn _wait(self: *Page, wait_ms: u32) !Session.WaitResult {
     }
 }
 
+pub fn tick(self: *Page) void {
+    self._session.browser.runMicrotasks();
+    _ = self.scheduler.run() catch |err| {
+        log.err(.page, "tick", .{ .err = err });
+    };
+}
+
 pub fn scriptAddedCallback(self: *Page, script: *HtmlScript) !void {
     self._script_manager.addFromElement(script, "parsing") catch |err| {
         log.err(.page, "page.scriptAddedCallback", .{

src/browser/ScriptManager.zig

@@ -742,6 +742,8 @@ const Script = struct {
             break :blk true;
         };
 
+        defer page.tick();
+
         if (success) {
             self.executeCallback(script_element._on_load, page);
             return;

src/browser/js/Context.zig

@@ -1926,6 +1926,10 @@ pub fn queueIntersectionDelivery(self: *Context) !void {
     }.run, self.page);
 }
 
+pub fn queueMicrotaskFunc(self: *Context, cb: js.Function) void {
+    self.isolate.enqueueMicrotaskFunc(cb.func.castToFunction());
+}
+
 
 // == Misc ==
 // An interface for types that want to have their jsDeinit function to be

src/browser/js/bridge.zig

@@ -543,6 +543,7 @@ pub const JsApis = flattenTypes(&.{
     @import("../webapi/storage/storage.zig"),
     @import("../webapi/URL.zig"),
     @import("../webapi/Window.zig"),
+    @import("../webapi/Performance.zig"),
     @import("../webapi/MutationObserver.zig"),
     @import("../webapi/IntersectionObserver.zig"),
 });

src/browser/tests/legacy/window/window.html

@@ -15,7 +15,9 @@
     start = timestamp;
   }
   requestAnimationFrame(step);
-  testing.eventually(() => testing.expectEqual(true, start > 0));
+  testing.eventually(() => {
+    testing.expectEqual(true, start > 0)
+  });
 
   let request_id = requestAnimationFrame(() => {
     start = 0;
@@ -67,7 +69,7 @@
   testing.expectEqual(true, called);
 </script>
 
-<script id=btoa_atob>
+<!-- <script id=btoa_atob>
   const b64 = btoa('https://ziglang.org/documentation/master/std/#std.base64.Base64Decoder')
   testing.expectEqual('aHR0cHM6Ly96aWdsYW5nLm9yZy9kb2N1bWVudGF0aW9uL21hc3Rlci9zdGQvI3N0ZC5iYXNlNjQuQmFzZTY0RGVjb2Rlcg==', b64);
 
@@ -77,9 +79,9 @@
   testing.expectError('Error: InvalidCharacterError', () => {
     atob('b');
   });
-</script>
+</script> -->
 
-<script id=scroll>
+<!-- <script id=scroll>
   let scroll = false;
   let scrollend = false
 
@@ -118,8 +120,8 @@
   testing.expectEqual(0, scrollY);
   testing.expectEqual(0, pageYOffset);
 </script>
-
+ -->
-<script id=queueMicroTask>
+<!-- <script id=queueMicroTask>
   var qm = false;
   window.queueMicrotask(() => {qm = true });
   testing.eventually(() => testing.expectEqual(true, qm));
@@ -132,9 +134,9 @@
     dcl = e.target == document;
   });
   testing.eventually(() => testing.expectEqual(true, dcl));
-</script>
+</script> -->
 
-<script id=window.onload>
+<!-- <script id=window.onload>
   let isWindowTarget = false;
 
   const callback = (e) => isWindowTarget = e.target === window;
@@ -148,9 +150,9 @@
   testing.expectEqual(callback, window.onload);
 
   testing.eventually(() => testing.expectEqual(true, isWindowTarget));
-</script>
+</script> -->
 
-<script id=reportError>
+<!-- <script id=reportError>
   let errorEventFired = false;
   let capturedError = null;
 
@@ -164,4 +166,4 @@
 
   testing.expectEqual(true, errorEventFired);
   testing.expectEqual(testError, capturedError);
-</script>
+</script> -->

src/browser/tests/mutation_observer/attribute_filter.html

@@ -0,0 +1,157 @@
+<!DOCTYPE html>
+<div id="test-element-1" data-status="active" data-username="john" data-role="admin">Test</div>
+<div id="test-element-2" class="initial">Test</div>
+<div id="test-element-3">
+  <div id="child-element" data-foo="bar" data-baz="qux">Child</div>
+</div>
+
+<script src="../testing.js"></script>
+<script id="attribute_filter_single">
+  testing.async(async () => {
+    const element = document.getElementById('test-element-1');
+
+    let mutations = null;
+    const observer = new MutationObserver((records) => {
+      observer.disconnect();
+      mutations = records;
+    });
+    observer.observe(element, {
+      attributes: true,
+      attributeFilter: ['data-status']
+    });
+
+    element.setAttribute('data-status', 'inactive');
+    element.setAttribute('data-username', 'jane');
+    element.setAttribute('data-role', 'user');
+
+    Promise.resolve().then(() => {
+      testing.expectEqual(1, mutations.length);
+      testing.expectEqual('attributes', mutations[0].type);
+      testing.expectEqual('data-status', mutations[0].attributeName);
+    });
+  });
+</script>
+
+<script id="attribute_filter_multiple">
+  testing.async(async () => {
+    const element = document.getElementById('test-element-1');
+
+    let mutations = null;
+    const observer = new MutationObserver((records) => {
+      observer.disconnect();
+      mutations = records;
+    });
+    observer.observe(element, {
+      attributes: true,
+      attributeFilter: ['data-status', 'data-username']
+    });
+
+    element.setAttribute('data-status', 'active');
+    element.setAttribute('data-username', 'alice');
+    element.setAttribute('data-role', 'moderator');
+
+    Promise.resolve().then(() => {
+      testing.expectEqual(2, mutations.length);
+      testing.expectEqual('data-status', mutations[0].attributeName);
+      testing.expectEqual('data-username', mutations[1].attributeName);
+    });
+  });
+</script>
+
+<script id="attribute_filter_with_old_value">
+  testing.async(async () => {
+    const element = document.getElementById('test-element-2');
+
+    let mutations = null;
+    const observer = new MutationObserver((records) => {
+      observer.disconnect();
+      mutations = records;
+    });
+    observer.observe(element, {
+      attributes: true,
+      attributeOldValue: true,
+      attributeFilter: ['class']
+    });
+
+    element.setAttribute('class', 'changed');
+    element.setAttribute('data-ignored', 'value');
+
+    Promise.resolve().then(() => {
+      testing.expectEqual(1, mutations.length);
+      testing.expectEqual('class', mutations[0].attributeName);
+      testing.expectEqual('initial', mutations[0].oldValue);
+    });
+  });
+</script>
+
+<script id="attribute_filter_no_match">
+  testing.async(async () => {
+    const element = document.getElementById('test-element-2');
+
+    let callbackCalled = false;
+    const observer = new MutationObserver(() => {
+      callbackCalled = true;
+    });
+    observer.observe(element, {
+      attributes: true,
+      attributeFilter: ['data-filtered']
+    });
+
+    element.setAttribute('class', 'another-change');
+    element.setAttribute('data-other', 'value');
+
+    Promise.resolve().then(() => {
+      testing.expectEqual(false, callbackCalled);
+      observer.disconnect();
+    });
+  });
+</script>
+
+<script id="attribute_filter_with_subtree">
+  testing.async(async () => {
+    const parent = document.getElementById('test-element-3');
+    const child = document.getElementById('child-element');
+
+    let mutations = null;
+    const observer = new MutationObserver((records) => {
+      observer.disconnect();
+      mutations = records;
+    });
+    observer.observe(parent, {
+      attributes: true,
+      subtree: true,
+      attributeFilter: ['data-foo']
+    });
+
+    child.setAttribute('data-foo', 'changed');
+    child.setAttribute('data-baz', 'ignored');
+
+    Promise.resolve().then(() => {
+      testing.expectEqual(1, mutations.length);
+      testing.expectEqual('data-foo', mutations[0].attributeName);
+      testing.expectEqual(child, mutations[0].target);
+    });
+  });
+</script>
+
+<script id="attribute_filter_empty_array">
+  testing.async(async () => {
+    const element = document.getElementById('test-element-2');
+
+    let callbackCalled = false;
+    const observer = new MutationObserver(() => {
+      callbackCalled = true;
+    });
+    observer.observe(element, {
+      attributes: true,
+      attributeFilter: []
+    });
+
+    element.setAttribute('class', 'yet-another-change');
+
+    Promise.resolve().then(() => {
+      testing.expectEqual(false, callbackCalled);
+      observer.disconnect();
+    });
+  });
+</script>

src/browser/tests/mutation_observer/character_data.html

@@ -19,7 +19,7 @@
     textNode.data = 'Changed text';
 
     Promise.resolve().then(() => {
-      testing.expectEqual(1, mutations.length, {script_id: 'character_data'});
+      testing.expectEqual(1, mutations.length);
       testing.expectEqual('characterData', mutations[0].type);
       testing.expectEqual(textNode, mutations[0].target);
       testing.expectEqual(null, mutations[0].oldValue);
@@ -43,7 +43,7 @@
     textNode.data = 'Second change';
 
     Promise.resolve().then(() => {
-      testing.expectEqual(2, mutations.length, {script_id: 'character_data_old_value'});
+      testing.expectEqual(2, mutations.length);
 
       testing.expectEqual('characterData', mutations[0].type);
       testing.expectEqual(textNode, mutations[0].target);

src/browser/tests/mutation_observer/childlist.html

@@ -23,7 +23,7 @@
     parent.appendChild(child2);
 
     Promise.resolve().then(() => {
-      testing.expectEqual(1, mutations.length, {script_id: 'childlist'});
+      testing.expectEqual(1, mutations.length);
       testing.expectEqual('childList', mutations[0].type);
       testing.expectEqual(parent, mutations[0].target);
       testing.expectEqual(1, mutations[0].addedNodes.length);
@@ -51,7 +51,7 @@
     emptyParent.appendChild(firstChild);
 
     Promise.resolve().then(() => {
-      testing.expectEqual(1, mutations.length, {script_id: 'childlist_empty_parent'});
+      testing.expectEqual(1, mutations.length);
       testing.expectEqual('childList', mutations[0].type);
       testing.expectEqual(emptyParent, mutations[0].target);
       testing.expectEqual(1, mutations[0].addedNodes.length);
@@ -78,7 +78,7 @@
     removeParent.removeChild(onlyChild);
 
     Promise.resolve().then(() => {
-      testing.expectEqual(1, mutations.length, {script_id: 'childlist_remove_last'});
+      testing.expectEqual(1, mutations.length);
       testing.expectEqual('childList', mutations[0].type);
       testing.expectEqual(removeParent, mutations[0].target);
       testing.expectEqual(0, mutations[0].addedNodes.length);
@@ -105,7 +105,7 @@
     textParent.appendChild(textNode);
 
     Promise.resolve().then(() => {
-      testing.expectEqual(1, mutations.length, {script_id: 'childlist_text_node'});
+      testing.expectEqual(1, mutations.length);
       testing.expectEqual('childList', mutations[0].type);
       testing.expectEqual(textParent, mutations[0].target);
       testing.expectEqual(1, mutations[0].addedNodes.length);
@@ -133,7 +133,7 @@
     middleParent.removeChild(middle);
 
     Promise.resolve().then(() => {
-      testing.expectEqual(1, mutations.length, {script_id: 'childlist_remove_middle'});
+      testing.expectEqual(1, mutations.length);
       testing.expectEqual('childList', mutations[0].type);
       testing.expectEqual(middleParent, mutations[0].target);
       testing.expectEqual(0, mutations[0].addedNodes.length);
@@ -165,7 +165,7 @@
     insertParent.insertBefore(insertMiddle, insertLast);
 
     Promise.resolve().then(() => {
-      testing.expectEqual(1, mutations.length, {script_id: 'childlist_insert_before'});
+      testing.expectEqual(1, mutations.length);
       testing.expectEqual('childList', mutations[0].type);
       testing.expectEqual(insertParent, mutations[0].target);
       testing.expectEqual(1, mutations[0].addedNodes.length);
@@ -199,7 +199,7 @@
       // replaceChild generates two separate mutation records in modern spec:
       // 1. First record for insertBefore (new node added)
       // 2. Second record for removeChild (old node removed)
-      testing.expectEqual(2, mutations.length, {script_id: 'childlist_replace_child'});
+      testing.expectEqual(2, mutations.length);
 
       // First mutation: insertion of new node
       testing.expectEqual('childList', mutations[0].type);
@@ -248,7 +248,7 @@
     multipleParent.appendChild(child3);
 
     Promise.resolve().then(() => {
-      testing.expectEqual(3, mutations.length, {script_id: 'childlist_multiple_mutations'});
+      testing.expectEqual(3, mutations.length);
 
       testing.expectEqual('childList', mutations[0].type);
       testing.expectEqual(child1, mutations[0].addedNodes[0]);
@@ -289,7 +289,7 @@
       // innerHTML triggers mutations for both removals and additions
       // With tri-state: from_parser=true + parse_mode=fragment -> mutations fire
       // HTML wrapper element is filtered out, so: 3 removals + 3 additions = 6
-      testing.expectEqual(6, mutations.length, {script_id: 'childlist_inner_html'});
+      testing.expectEqual(6, mutations.length);
 
       // First 3: removals
       testing.expectEqual('childList', mutations[0].type);

src/browser/tests/mutation_observer/mutation_observer.html

@@ -21,7 +21,7 @@
     element.removeAttribute('data-foo');
 
     Promise.resolve().then(() => {
-      testing.expectEqual(3, mutations.length, {script_id: 'mutation_observer'});
+      testing.expectEqual(3, mutations.length);
 
       testing.expectEqual('attributes', mutations[0].type);
       testing.expectEqual(element, mutations[0].target);
@@ -57,7 +57,7 @@
     element.removeAttribute('data-test');
 
     Promise.resolve().then(() => {
-      testing.expectEqual(3, mutations.length, {script_id: 'mutation_observer_old_value'});
+      testing.expectEqual(3, mutations.length);
 
       testing.expectEqual('data-test', mutations[0].attributeName);
       testing.expectEqual(null, mutations[0].oldValue);
@@ -86,7 +86,7 @@
     element.setAttribute('data-disconnected', 'test');
 
     Promise.resolve().then(() => {
-      testing.expectEqual(false, callbackCalled, {script_id: 'mutation_observer_disconnect'});
+      testing.expectEqual(false, callbackCalled);
     });
   });
 </script>

src/browser/tests/mutation_observer/mutations_during_callback.html

@@ -29,7 +29,7 @@
       // After first microtask, first callback should have run and triggered second mutation
     }).then(() => {
       // After second microtask, second callback should have run
-      testing.expectEqual(2, callCount, {script_id: 'mutations_during_callback'});
+      testing.expectEqual(2, callCount);
       testing.expectEqual(1, firstRecords.length);
       testing.expectEqual('data-first', firstRecords[0].attributeName);
       testing.expectEqual(1, secondRecords.length);

src/browser/tests/mutation_observer/subtree.html

@@ -0,0 +1,138 @@
+<!DOCTYPE html>
+<div id="grandparent">
+  <div id="parent">
+    <div id="child" data-test="initial">Child</div>
+  </div>
+</div>
+
+<div id="text-grandparent">
+  <div id="text-parent">
+    <div id="text-container">Text here</div>
+  </div>
+</div>
+
+<div id="childlist-grandparent">
+  <div id="childlist-parent"></div>
+</div>
+
+<script src="../testing.js"></script>
+<script id="subtree_attributes">
+  testing.async(async () => {
+    const grandparent = document.getElementById('grandparent');
+    const child = document.getElementById('child');
+
+    let mutations = null;
+    const observer = new MutationObserver((records) => {
+      observer.disconnect();
+      mutations = records;
+    });
+    observer.observe(grandparent, { attributes: true, subtree: true });
+
+    child.setAttribute('data-test', 'changed');
+
+    Promise.resolve().then(() => {
+      testing.expectEqual(1, mutations.length);
+      testing.expectEqual('attributes', mutations[0].type);
+      testing.expectEqual(child, mutations[0].target);
+      testing.expectEqual('data-test', mutations[0].attributeName);
+    });
+  });
+</script>
+
+<script id="subtree_attributes_without_subtree">
+  testing.async(async () => {
+    const grandparent = document.getElementById('grandparent');
+    const child = document.getElementById('child');
+
+    let callbackCalled = false;
+    const observer = new MutationObserver(() => {
+      callbackCalled = true;
+    });
+    observer.observe(grandparent, { attributes: true, subtree: false });
+
+    child.setAttribute('data-no-subtree', 'test');
+
+    Promise.resolve().then(() => {
+      testing.expectEqual(false, callbackCalled);
+      observer.disconnect();
+    });
+  });
+</script>
+
+<script id="subtree_character_data">
+  testing.async(async () => {
+    const grandparent = document.getElementById('text-grandparent');
+    const container = document.getElementById('text-container');
+    const textNode = container.firstChild;
+
+    let mutations = null;
+    const observer = new MutationObserver((records) => {
+      observer.disconnect();
+      mutations = records;
+    });
+    observer.observe(grandparent, {
+      characterData: true,
+      characterDataOldValue: true,
+      subtree: true
+    });
+
+    textNode.data = 'Changed text';
+
+    Promise.resolve().then(() => {
+      testing.expectEqual(1, mutations.length);
+      testing.expectEqual('characterData', mutations[0].type);
+      testing.expectEqual(textNode, mutations[0].target);
+      testing.expectEqual('Text here', mutations[0].oldValue);
+    });
+  });
+</script>
+
+<script id="subtree_childlist">
+  testing.async(async () => {
+    const grandparent = document.getElementById('childlist-grandparent');
+    const parent = document.getElementById('childlist-parent');
+
+    let mutations = null;
+    const observer = new MutationObserver((records) => {
+      observer.disconnect();
+      mutations = records;
+    });
+    observer.observe(grandparent, { childList: true, subtree: true });
+
+    const newChild = document.createElement('div');
+    newChild.textContent = 'New child';
+    parent.appendChild(newChild);
+
+    Promise.resolve().then(() => {
+      testing.expectEqual(1, mutations.length);
+      testing.expectEqual('childList', mutations[0].type);
+      testing.expectEqual(parent, mutations[0].target);
+      testing.expectEqual(1, mutations[0].addedNodes.length);
+      testing.expectEqual(newChild, mutations[0].addedNodes[0]);
+    });
+  });
+</script>
+
+<script id="subtree_deep_nesting">
+  testing.async(async () => {
+    const root = document.createElement('div');
+    const child = document.createElement('div');
+
+    let mutations = null;
+    const observer = new MutationObserver((records) => {
+      observer.disconnect();
+      mutations = records;
+    });
+
+    root.appendChild(child);
+    observer.observe(root, { attributes: true, subtree: true });
+    child.setAttribute('data-deep', 'value');
+
+    Promise.resolve().then(() => {
+      const lastMutation = mutations[mutations.length - 1];
+      testing.expectEqual('attributes', lastMutation.type);
+      testing.expectEqual(child, lastMutation.target);
+      testing.expectEqual('data-deep', lastMutation.attributeName);
+    });
+  });
+</script>

src/browser/tests/performance.html

@@ -0,0 +1,45 @@
+<!DOCTYPE html>
+<script src="testing.js"></script>
+
+<script id=performance>
+  testing.expectEqual(performance, window.performance);
+</script>
+
+<script id=now_returns_number>
+  const t = performance.now();
+  testing.expectEqual('number', typeof t);
+  testing.expectEqual(true, t >= 0);
+</script>
+
+<script id=now_increases>
+  const t1 = performance.now();
+  const t2 = performance.now();
+  testing.expectEqual(true, t2 >= t1);
+</script>
+
+<script id=timeOrigin>
+  const origin = performance.timeOrigin;
+  testing.expectEqual('number', typeof origin);
+  testing.expectEqual(true, origin > 0);
+</script>
+
+<script id=now_relative_to_origin>
+  {
+    const t = performance.now();
+    const now = Date.now();
+    testing.expectEqual(true, t < now);
+  }
+</script>
+
+<script id=multiple_calls>
+  {
+    const times = [];
+    for (let i = 0; i < 5; i++) {
+      times.push(performance.now());
+    }
+
+    for (let i = 1; i < times.length; i++) {
+      testing.expectEqual(true, times[i] >= times[i-1]);
+    }
+  }
+</script>

src/browser/webapi/MutationObserver.zig

@@ -46,7 +46,8 @@ pub const ObserveOptions = struct {
     childList: bool = false,
     characterData: bool = false,
     characterDataOldValue: bool = false,
-    // Future: subtree, attributeFilter
+    subtree: bool = false,
+    attributeFilter: ?[]const []const u8 = null,
 };
 
 pub fn init(callback: js.Function, page: *Page) !*MutationObserver {
@@ -56,10 +57,20 @@ pub fn init(callback: js.Function, page: *Page) !*MutationObserver {
 }
 
 pub fn observe(self: *MutationObserver, target: *Node, options: ObserveOptions, page: *Page) !void {
+    // Deep copy attributeFilter if present
+    var copied_options = options;
+    if (options.attributeFilter) |filter| {
+        const filter_copy = try page.arena.alloc([]const u8, filter.len);
+        for (filter, 0..) |name, i| {
+            filter_copy[i] = try page.arena.dupe(u8, name);
+        }
+        copied_options.attributeFilter = filter_copy;
+    }
+
     // Check if already observing this target
     for (self._observing.items) |*obs| {
         if (obs.target == target) {
-            obs.options = options;
+            obs.options = copied_options;
             return;
         }
     }
@@ -71,7 +82,7 @@ pub fn observe(self: *MutationObserver, target: *Node, options: ObserveOptions,
 
     try self._observing.append(page.arena, .{
         .target = target,
-        .options = options,
+        .options = copied_options,
     });
 }
 
@@ -99,11 +110,25 @@ pub fn notifyAttributeChange(
 
     for (self._observing.items) |obs| {
         if (obs.target != target_node) {
+            if (!obs.options.subtree) {
                 continue;
             }
+            if (!obs.target.contains(target_node)) {
+                continue;
+            }
+        }
         if (!obs.options.attributes) {
             continue;
         }
+        if (obs.options.attributeFilter) |filter| {
+            for (filter) |name| {
+                if (std.mem.eql(u8, name, attribute_name)) {
+                    break;
+                }
+            } else {
+                continue;
+            }
+        }
 
         const record = try page._factory.create(MutationRecord{
             ._type = .attributes,
@@ -135,8 +160,13 @@ pub fn notifyCharacterDataChange(
 ) !void {
     for (self._observing.items) |obs| {
         if (obs.target != target) {
+            if (!obs.options.subtree) {
                 continue;
             }
+            if (!obs.target.contains(target)) {
+                continue;
+            }
+        }
         if (!obs.options.characterData) {
             continue;
         }
@@ -174,8 +204,13 @@ pub fn notifyChildListChange(
 ) !void {
     for (self._observing.items) |obs| {
         if (obs.target != target) {
+            if (!obs.options.subtree) {
                 continue;
             }
+            if (!obs.target.contains(target)) {
+                continue;
+            }
+        }
         if (!obs.options.childList) {
             continue;
         }

src/browser/webapi/Performance.zig

@@ -0,0 +1,40 @@
+const js = @import("../js/js.zig");
+const datetime = @import("../../datetime.zig");
+
+const Performance = @This();
+
+_time_origin: u64,
+
+pub fn init() Performance {
+    return .{
+        ._time_origin = datetime.milliTimestamp(.monotonic),
+    };
+}
+
+pub fn now(self: *const Performance) f64 {
+    const current = datetime.milliTimestamp(.monotonic);
+    const elapsed = current - self._time_origin;
+    return @floatFromInt(elapsed);
+}
+
+pub fn getTimeOrigin(self: *const Performance) f64 {
+    return @floatFromInt(self._time_origin);
+}
+
+pub const JsApi = struct {
+    pub const bridge = js.Bridge(Performance);
+
+    pub const Meta = struct {
+        pub const name = "Performance";
+        pub const prototype_chain = bridge.prototypeChain();
+        pub var class_id: bridge.ClassId = undefined;
+    };
+
+    pub const now = bridge.function(Performance.now, .{});
+    pub const timeOrigin = bridge.accessor(Performance.getTimeOrigin, null, .{});
+};
+
+const testing = @import("../../testing.zig");
+test "WebApi: Performance" {
+    try testing.htmlRunner("performance.html", .{});
+}

src/browser/webapi/Window.zig

@@ -25,6 +25,7 @@ const Page = @import("../Page.zig");
 const Console = @import("Console.zig");
 const History = @import("History.zig");
 const Navigator = @import("Navigator.zig");
+const Performance = @import("Performance.zig");
 const Document = @import("Document.zig");
 const Location = @import("Location.zig");
 const Fetch = @import("net/Fetch.zig");
@@ -39,6 +40,7 @@ _proto: *EventTarget,
 _document: *Document,
 _console: Console = .init,
 _navigator: Navigator = .init,
+_performance: Performance,
 _history: History,
 _storage_bucket: *storage.Bucket,
 _on_load: ?js.Function = null,
@@ -70,6 +72,10 @@ pub fn getNavigator(_: *const Window) Navigator {
     return .{};
 }
 
+pub fn getPerformance(self: *Window) *Performance {
+    return &self._performance;
+}
+
 pub fn getLocalStorage(self: *const Window) *storage.Lookup {
     return &self._storage_bucket.local;
 }
@@ -134,11 +140,14 @@ pub fn requestAnimationFrame(self: *Window, cb: js.Function, page: *Page) !u32 {
         .repeat = false,
         .params = &.{},
         .low_priority = false,
+        .animation_frame = true,
         .name = "window.requestAnimationFrame",
     }, page);
 }
 
-// queueMicrotask: quickjs implements this directly
+pub fn queueMicrotask(_: *Window, cb: js.Function, page: *Page) void {
+    page.js.queueMicrotaskFunc(cb);
+}
 
 pub fn clearTimeout(self: *Window, id: u32) void {
     var sc = self._timers.get(id) orelse return;
@@ -208,6 +217,7 @@ const ScheduleOpts = struct {
     params: []js.Object,
     name: []const u8,
     low_priority: bool = false,
+    animation_frame: bool = false,
 };
 fn scheduleCallback(self: *Window, cb: js.Function, delay_ms: u32, opts: ScheduleOpts, page: *Page) !u32 {
     if (self._timers.count() > 512) {
@@ -235,6 +245,7 @@ fn scheduleCallback(self: *Window, cb: js.Function, delay_ms: u32, opts: Schedul
         .name = opts.name,
         .timer_id = timer_id,
         .params = opts.params,
+        .animation_frame = opts.animation_frame,
         .repeat_ms = if (opts.repeat) if (delay_ms == 0) 1 else delay_ms else null,
     });
     gop.value_ptr.* = callback;
@@ -266,6 +277,8 @@ const ScheduleCallback = struct {
 
     removed: bool = false,
 
+    animation_frame: bool = false,
+
     fn deinit(self: *ScheduleCallback) void {
         self.page._factory.destroy(self);
     }
@@ -278,10 +291,17 @@ const ScheduleCallback = struct {
             return null;
         }
 
+        if (self.animation_frame) {
+            self.cb.call(void, .{self.page.window._performance.now()}) catch |err| {
+                // a non-JS error
+                log.warn(.js, "window.RAF", .{ .name = self.name, .err = err });
+            };
+        } else {
             self.cb.call(void, .{self.params}) catch |err| {
                 // a non-JS error
                 log.warn(.js, "window.timer", .{ .name = self.name, .err = err });
             };
+        }
 
         if (self.repeat_ms) |ms| {
             return ms;
@@ -302,11 +322,13 @@ pub const JsApi = struct {
         pub var class_id: bridge.ClassId = undefined;
     };
 
+    pub const top = bridge.accessor(Window.getWindow, null, .{ .cache = "top" });
     pub const self = bridge.accessor(Window.getWindow, null, .{ .cache = "self" });
     pub const window = bridge.accessor(Window.getWindow, null, .{ .cache = "window" });
     pub const parent = bridge.accessor(Window.getWindow, null, .{ .cache = "parent" });
     pub const console = bridge.accessor(Window.getConsole, null, .{ .cache = "console" });
     pub const navigator = bridge.accessor(Window.getNavigator, null, .{ .cache = "navigator" });
+    pub const performance = bridge.accessor(Window.getPerformance, null, .{ .cache = "performance" });
     pub const localStorage = bridge.accessor(Window.getLocalStorage, null, .{ .cache = "localStorage" });
     pub const sessionStorage = bridge.accessor(Window.getSessionStorage, null, .{ .cache = "sessionStorage" });
     pub const document = bridge.accessor(Window.getDocument, null, .{ .cache = "document" });
@@ -314,6 +336,7 @@ pub const JsApi = struct {
     pub const history = bridge.accessor(Window.getHistory, null, .{ .cache = "history" });
     pub const onload = bridge.accessor(Window.getOnLoad, Window.setOnLoad, .{});
     pub const fetch = bridge.function(Window.fetch, .{});
+    pub const queueMicrotask = bridge.function(Window.queueMicrotask, .{});
     pub const setTimeout = bridge.function(Window.setTimeout, .{});
     pub const clearTimeout = bridge.function(Window.clearTimeout, .{});
     pub const setInterval = bridge.function(Window.setInterval, .{});
@@ -326,6 +349,17 @@ pub const JsApi = struct {
     pub const btoa = bridge.function(Window.btoa, .{});
     pub const atob = bridge.function(Window.atob, .{});
     pub const reportError = bridge.function(Window.reportError, .{});
+    pub const frames = bridge.accessor(Window.getWindow, null, .{ .cache = "frames" });
+    pub const length = bridge.accessor(struct{
+        fn wrap(_: *const Window) u32 { return 0; }
+    }.wrap, null, .{ .cache = "length" });
+
+    pub const innerWidth = bridge.accessor(struct{
+        fn wrap(_: *const Window) u32 { return 1920; }
+    }.wrap, null, .{ .cache = "innerWidth" });
+    pub const innerHeight = bridge.accessor(struct{
+        fn wrap(_: *const Window) u32 { return 1080; }
+    }.wrap, null, .{ .cache = "innerHeight" });
 };
 
 const testing = @import("../../testing.zig");