JavaScript (Web Almanac 2022)

	A	B	C	D	E	F
1	Measurement	New Custom Metric Added?	Available in Previous Year?	Query	Link to Results Sheet	Comments
2	How much JavaScript do we load?
3	Requests per page	n	y	sql/2022/javascript/requests_2022.sql	requests_2022.sql	Requests grouped by percentile. Queries for 2021, 2020 and 2019 are also available
4	Bytes per page	n	y	sql/2022/javascript/bytes_2022.sql	bytes_2022.sql	Bytes grouped by percentile. Queries for 2021, 2020 and 2019 are also available
5	Unused scripts (or unused bytes per page)	n	y	sql/2022/javascript/unused_js_bytes_distribution.sql	unused_js_bytes_distribution.sql	Taken from Lighthouse audits. Unused JS bytes grouped by percentile.
6	How is JavaScript processed?
7	Bundlers	y	n	sql/2022/javascript/usage_of_webpack.sql sql/2022/javascript/usage_of_parcel.sql sql/2022/javascript/usage_of_webpack_by_rank.sql sql/2022/javascript/usage_of_parcel_by_rank.sql	usage_of_webpack.sql usage_of_parcel.sql usage_of_webpack_by_rank.sql usage_of_parcel_by_rank.sql	Webpack and Parcel are available in Wappalyzer, but esbuild and RollupJS are not. Prepared custom metric for Webpack and Parcel.https://github.com/HTTPArchive/custom-metrics/pull/40
8	Transpilers	y	n	sql/2022/javascript/usage_of_typescript_and_babel.sql sql/2022/javascript/usage_of_typescript_and_babel_by_rank.sql	usage_of_typescript_and_babel.sql usage_of_typescript_and_babel_by_rank.sql	https://httparchive.slack.com/archives/C02NSJST9K5/p1653598536287859
9	How is JavaScript requested
10	async and defer	n	y	sql/2022/javascript/breakdown_of_pages_using_async_defer.sql sql/2022/javascript/breakdown_of_scripts_using_async_defer.sql	breakdown_of_pages_using_async_defer.sql breakdown_of_scripts_using_async_defer.sql	Percent and count of pages using async or defer
11	module and nomodule	n	y	sql/2022/javascript/breakdown_of_pages_using_async_defer.sql sql/2022/javascript/breakdown_of_scripts_using_async_defer.sql	breakdown_of_pages_using_async_defer.sql breakdown_of_scripts_using_async_defer.sql	Percent and count of pages using module or nomodule
12	preload, prefetch and modulepreload	n	n	sql/2022/javascript/resource-hints-prefetch-preload-percentage.sql sql/2022/javascript/resource-hints-preload-prefetch-distribution.sql	resource_hints.sql resource_hints_per_page.sql resource-hints-prefetch-preload-percentage.sql resource-hints-preload-prefetch-distribution.sql	Distribution, percent and count of pages using preload or prefetch. Need to add modulepreload
13	JavaScript in the <head> (render blocking JavaScript (excluding inline))	n	n	sql/2022/javascript/render_blocking_javascript.sql sql/2022/javascript/render_blocking_javascript_by_rank.sql	render_blocking_javascript.sql render_blocking_javascript_by_rank.sql	Available in HAR as _renderBlocking: "blocking"
14	Injected scripts	y	n	sql/2022/javascript/injected_scripts.sql sql/2022/javascript/distribution_of_injected_scripts.sql	injected_scripts.sql distribution_of_injected_scripts.sql	Custom metric: https://github.com/HTTPArchive/custom-metrics/pull/42
15	First-party vs third-party: Requests per page	n	y	sql/2022/javascript/requests_by_3p.sql	requests_by_3p.sql	Distribution of 1P/3P JS requests grouped by percentile and host.
16	First-party vs third-party: Bytes per page	n	y	sql/2022/javascript/bytes_by_3p.sql	bytes_by_3p.sql	Distribution of 1P/3P JS bytes grouped by percentile and host.
17	dns-prefetch	n	n	sql/2022/javascript/percent_of_dns_prefetch.sql sql/2022/javascript/percent_of_dns_prefetch_by_host.sql	percent_of_dns_prefetch.sql percent_of_dns_prefetch_by_host.sql
18	preconnect	n	n	sql/2022/javascript/percent_of_preconnect.sql sql/2022/javascript/percent_of_preconnect_by_host.sql	percent_of_preconnect.sql percent_of_preconnect_by_host.sql
19	Dynamic import	n	n	sql/2022/javascript/dynamic_import.sql	dynamic_import.sql	New metric added from Blink use counters
20	Web workers	y	n	sql/2022/javascript/web_workers.sql	web_workers.sql	Dependent on observers.js https://github.com/HTTPArchive/custom-metrics/pull/31 Implemented alternative using blink usage counters.
21	PaintWorklet	n	n	sql/2022/javascript/worklets.sql	worklets.sql	New metric added from Blink use counters
22	AudioWorklet	n	n	sql/2022/javascript/worklets.sql	worklets.sql	New metric added from Blink use counters
23	How is JavaScript delivered?
24	Compression	n	y	sql/2022/javascript/compression_method.sql sql/2022/javascript/compression_none_by_bytes.sql sql/2022/javascript/compression_method_by_3p.sql	compression_method.sql compression_none_by_bytes.sql compression_method_by_3p.sql
25	Minification	n	y	sql/2022/javascript/lighthouse_unminified_js.sql sql/2022/javascript/lighthouse_unminified_js_bytes.sql sql/2022/javascript/lighthouse_unminified_js_by_3p.sql	lighthouse_unminified_js.sql lighthouse_unminified_js_bytes.sql lighthouse_unminified_js_by_3p.sql
26	Source maps	y	y	sql/2022/javascript/sourcemaps.sql sql/2022/javascript/sourcemap_header.sql sql/2022/javascript/sourcemap_header_by_3p.sql	sourcemaps.sql sourcemap_header.sql sourcemap_header_by_3p.sql	Current query only checks for SourceMap header. Custom metric: https://github.com/HTTPArchive/custom-metrics/pull/41
27	Responsiveness
28	Metrics: TTI	n	n	sql/2022/javascript/time_to_interactive.sql	time_to_interactive.sql	Is available in Lighthouse audits
29	Metrics: TBT	n	n	sql/2022/javascript/tbt.sql	tbt.sql	TBT grouped by percentiles.
30	Metrics: FID	n	n	sql/2022/javascript/fid.sql	fid.sql	Available in CrUX dataset. FID grouped by percentiles.
31	Metrics: INP	n	n	sql/2022/javascript/inp.sql	inp.sql	Available in CrUX dataset. INP grouped by percentiles.
32	Number of long tasks	n	n	sql/2022/javascript/distribution_of_number_of_long_tasks.sql	distribution_of_number_of_long_tasks.sql	Available in HAR.
33	Total long tasks	n	n	sql/2022/javascript/distribution_of_long_tasks_time.sql	distribution_of_long_tasks_time.sql	Available in HAR.
34	requestIdleCallback	y	n			WON'T BE DONE. Dependent on observers.js https://github.com/HTTPArchive/custom-metrics/pull/38
35	queueMicrotask	y	n			WON'T BE DONE. Dependent on observers.js https://github.com/HTTPArchive/custom-metrics/pull/38
36	postTask API	n	n	sql/2022/javascript/posttask_scheduler.sql	posttask_scheduler.sql	https://chromestatus.com/metrics/feature/timeline/popularity/3145
37	Synchronous AJAX	n	y	sql/2022/javascript/sync_requests.sql	sync_requests.sql	New metric added from Blink use counters
38	How is JavaScript used?
39	Libraries and frameworks: Library usage	n	y	sql/2022/javascript/frameworks_libraries.sql sql/2022/javascript/frameworks_libraries_by_version.sql sql/2022/javascript/frameworks-bytes-by-framework.sql	frameworks_libraries.sql frameworks_libraries_by_version.sql frameworks-bytes-by-framework.sql
40	Libraries and frameworks: Libraries used together	n	y	sql/2022/javascript/frameworks_libraries_combos.sql	frameworks_libraries_combos.sql
41	Libraries and frameworks: Security Vulnerabilities	n	y	sql/2022/javascript/lighthouse_vulnerabilities.sql sql/2022/javascript/lighthouse_vulnerable_libraries.sql	lighthouse_vulnerabilities.sql lighthouse_vulnerable_libraries.sql
42	Web components and shadow DOM	n	y	sql/2022/javascript/web_components_pct.sql sql/2022/javascript/web_components_specs.sql	web_components_pct.sql web_components_specs.sql	Percentage of pages using custom elements, shadow root or templates.
43	document.write	n	n	sql/2022/javascript/usage_of_document_write.sql	usage_of_document_write.sql	https://github.com/GoogleChrome/lighthouse/blob/master/lighthouse-core/audits/dobetterweb/no-document-write.js
44	legacy javascript		n	sql/2022/javascript/usage_of_legacy_javascript.sql	usage_of_legacy_javascript.sql	Taken from Lighthouse audit
45	Web components and shadow DOM: is attribute	n	n	sql/2022/javascript/web_components_is_attribute.sql	web_components_is_attribute.sql
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