alexnj

こんにちは TAG-さん!

I'm requesting a TAG review of expect-no-linked-resources Document-Policy.

User Agents have implemented speculative parsing of HTML to speculatively fetch resources that are present in the HTML markup, to speed up page loading. For the vast majority of pages on the Web that have resources declared in the HTML markup, the optimization is beneficial and the cost paid in determining such resources is a sound tradeoff. However, the following scenarios might result in a sub-optimal performance tradeoff vs. the explicit time spent parsing HTML for determining sub resources to fetch:

• Pages that do not have any resources declared in the HTML.
• Large HTML pages with minimal or no resource loads that could explicitly control preloading resources via other preload mechanisms available.

This proposal introduces a configuration point in [Document Policy](htt

alexnj

diff --git a/third_party/blink/public/mojom/use_counter/metrics/web_feature.mojom b/third_party/blink/public/mojom/use_counter/metrics/web_feature.mojom
index 0d8c64ff3be78..08008cf9b66b0 100644
--- a/third_party/blink/public/mojom/use_counter/metrics/web_feature.mojom
+++ b/third_party/blink/public/mojom/use_counter/metrics/web_feature.mojom
@@ -3881,6 +3881,8 @@ enum WebFeature {
   kGamepadTouchSurfaceDimension = 4540,
   kSandboxViaFencedFrame = 4541,
   kVisibilityStateObserver = 4542,
+  kCookieGetThirdParty = 4543,
+  kCookieGetFirstParty = 4544,

alexnj

diff --git a/third_party/blink/renderer/core/timing/performance_user_timing.cc b/third_party/blink/renderer/core/timing/performance_user_timing.cc
index 1056e5c6f04d7..3f7a36ba36450 100644
--- a/third_party/blink/renderer/core/timing/performance_user_timing.cc
+++ b/third_party/blink/renderer/core/timing/performance_user_timing.cc
@@ -210,12 +210,28 @@ PerformanceMeasure* UserTiming::Measure(ScriptState* script_state,
     WTF::AddFloatToHash(hash, start_time);
     WTF::AddFloatToHash(hash, end_time);
 
+    v8::Local<v8::Context> context =
+        performance_->GetExecutionContext()->GetIsolate()->GetCurrentContext();

alexnj

diff --git a/base/trace_event/common/trace_event_common.h b/base/trace_event/common/trace_event_common.h
index f2ee4d36b317d..7d5731053bbd7 100644
--- a/base/trace_event/common/trace_event_common.h
+++ b/base/trace_event/common/trace_event_common.h
@@ -965,6 +965,13 @@ struct BASE_EXPORT TraceTimestampTraits<::base::TimeTicks> {
       TRACE_EVENT_PHASE_NESTABLE_ASYNC_BEGIN, category_group, name, id,    \
       TRACE_EVENT_API_CURRENT_THREAD_ID, timestamp, TRACE_EVENT_FLAG_COPY, \
       arg1_name, arg1_val)
+#define TRACE_EVENT_COPY_NESTABLE_ASYNC_BEGIN_WITH_TIMESTAMP2(             \
+    category_group, name, id, timestamp, arg1_name, arg1_val,              \

alexnj

{
  "transformations": [
    [1, "h2:nth-of-type(1)", 6, "Documentation"],
    [2, "img[alt$=\"Logo\"]", 8, "alt", "Marketing alt text"]
  ]
}

alexnj

{
  "lighthouseVersion": "10.0.0",
  "requestedUrl": "https://www.theverge.com/",
  "mainDocumentUrl": "https://www.theverge.com/",
  "finalDisplayedUrl": "https://www.theverge.com/",
  "finalUrl": "https://www.theverge.com/",
  "fetchTime": "2023-02-16T16:34:40.104Z",
  "gatherMode": "navigation",
  "runWarnings": [],
  "userAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.0.0 Safari/537.36",

alexnj

{
    "lighthouseVersion": "10.0.1",
    "requestedUrl": "https://www.theverge.com/",
    "mainDocumentUrl": "https://www.theverge.com/",
    "finalDisplayedUrl": "https://www.theverge.com/",
    "finalUrl": "https://www.theverge.com/",
    "fetchTime": "2023-02-16T16:34:40.104Z",
    "gatherMode": "navigation",
    "runWarnings": [],
    "userAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.0.0 Safari/537.36",

alexnj

{
  "lighthouseVersion": "9.5.0",
  "requestedUrl": "https://theverge.com/",
  "mainDocumentUrl": "https://www.theverge.com/",
  "finalDisplayedUrl": "https://www.theverge.com/",
  "finalUrl": "https://www.theverge.com/",
  "fetchTime": "2022-12-16T01:34:12.691Z",
  "gatherMode": "navigation",
  "runWarnings": [
    "The page may not be loading as expected because your test URL (https://theverge.com/) was redirected to https://www.theverge.com/. Try testing the second URL directly."

alexnj

{
  "control": {
    "url": "https://todomvc.com/examples/react", 
    "cache": {
    }
  },
  "variants": [
    {
      "weight": 0.5,
      "url": "https://todomvc.com/examples/react", 

alexnj

$ node core/scripts/compare-runs.js --name base --collect -n 20 \
    --urls https://vividmotion.co/
$ node core/scripts/compare-runs.js --name nogpu --collect -n 20 \
    --lh-flags='--chrome-flags=--disable-gpu' --urls https://vividmotion.co/
$ node core/scripts/compare-runs.js --name base --name nogpu --compare  

┌─────────┬───────────────────────────────────────────────┬───────────────────────────┬─────────────────────┬─────────┬──────────────────────┬────────┐
│ (index) │                     name                      │            url            │        mean         │ mean Δ  │          cv          │  cv Δ  │
├─────────┼───────────────────────────────────────────────┼───────────────────────────┼─────────────────────┼─────────┼──────────────────────┼────────┤
│    0    │              'lh:runner:gather'               │ 'https://vividmotion.co/' │ '8808.4 -> 39237.2' │ 30428.8 │   '1.404 -> 0.581'   │  -0.8  │