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Maglev - V8â€™s Fastest Optimizing JIT Â· V8
In Chrome M117 we introduced a new optimizing compiler: Maglev. Maglev sits between our existing Sparkplug and TurboFan compilers, and fills the role of a fast optimizing compiler that generates good enough code, fast enough. Background # Until 2021 V8 had two main execution tiers: Ignition, the interpreter; and TurboFan, V8â€™s optimizing compiler focused on peak performance. All JavaScript code is
mizdra 2024/04/28
ã™ã”ã„

javascript

performance

browser
ãƒªãƒ³ã‚¯
ãƒ’ãƒ¼ãƒ— ã‚¹ãƒŠãƒƒãƒ—ã‚·ãƒ§ãƒƒãƒˆã‚’è¨˜éŒ²ã™ã‚‹ Â |Â Chrome DevTools Â |Â Chrome for Developers
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mizdra 2024/03/27
memory

javascript

browser
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JavaScript ã®ã‚¹ãƒ¬ãƒƒãƒ‰ä¸¦åˆ—å®Ÿè¡Œç’°å¢ƒ
ã“ã‚Œã¯ Chromium Browser ã‚¢ãƒ‰ãƒ™ãƒ³ãƒˆã‚«ãƒ¬ãƒ³ãƒ€ãƒ¼ã®åæ—¥ç›®ã®è¨˜äº‹ã§ã™ã€‚æœ¬è¨˜äº‹ã§ã¯ Chromium ã«ãŠã‘ã‚‹ JavaScript ã®ã‚¹ãƒ¬ãƒƒãƒ‰ä¸¦åˆ—å®Ÿè¡Œç’°å¢ƒã«ã¤ã„ã¦ä»•æ§˜ãƒ»å®Ÿè£…ãƒ»API ã®é¢ã‹ã‚‰åŒ…æ‹¬çš„ã«ç´¹ä»‹ã—ã¾ã™ã€‚ãƒ–ãƒ©ã‚¦ã‚¶ã®å†…éƒ¨å®Ÿè£…ã«èˆˆå‘³ãŒã‚ã‚‹äººã‚’å¯¾è±¡ã«ã€å„æ©Ÿèƒ½ã®ä½¿ã„æ–¹ã§ã¯ãªãå®Ÿè¡Œãƒ¢ãƒ‡ãƒ«ã«ç„¦ç‚¹ã‚’å½“ã¦ã¦èª¬æ˜Žã—ã¦ã„ã‚‹ãŸã‚ã€é›£æ˜“åº¦ã¯é«˜ã„ã§ã™ã€‚ä½¿ã„æ–¹ã‚’çŸ¥ã‚ŠãŸã„äººã¯ MDN ãªã©ã®è¨˜äº‹ã‚’èªã‚“ã§ãã ã•ã„ã€‚ã“ã®è¨˜äº‹ã‚’ãã£ã‹ã‘ã«å®Ÿè£…è§£èªã«æŒ‘æˆ¦ã—ã¦ã¿ã‚‹äººãŒä¸€äººã§ã‚‚å¢—ãˆã‚‹ã¨å¹¸ã„ã§ã™ã€‚ æœ¬è¨˜äº‹ã‚’æ›¸ãã«ã‚ãŸã‚Šã€yuki3 ã•ã‚“ã«å¤šãã®ã‚³ãƒ¡ãƒ³ãƒˆã‚’ã„ãŸã ãã€è°è«–ã«ä»˜ãåˆã£ã¦ã„ãŸã ãã¾ã—ãŸã€‚ã‚ã‚ŠãŒã¨ã†ã”ã–ã„ã¾ã—ãŸã€‚ãªãŠã€æ–‡è²¬ã¯ã™ã¹ã¦ç§ (nhiroki) ã«ã‚ã‚Šã¾ã™ã€‚èª¤ã‚Šã‚„è£œè¶³ã€è³ªå•ãªã©ã¯æ°—è»½ã« GitHub Issue ã‚‚ã—ãã¯ Twitter ã¸ãŠå¯„ã›ãã ã•ã„ã€‚ æ›´æ–°å±¥æ´ 2018/01/15 Layout
mizdra 2022/12/14
Worklet/Tasklet ãªã‚‹ã»ã©

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browser

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setTimeout ã‚’å®Œç’§ã«ç†è§£ã™ã‚‹
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mizdra 2022/11/22
ã‚ˆã‹ã£ãŸ / ãµã¨èª¿ã¹ã¦ã¿ãŸã‚‰ã€Chrome 108 ã‹ã‚‰ã¯ä»Šã®5å›žç›®ã‹ã‚‰å¤§å¹…ã«å¢—ã‚„ã—ã¦16å›žç›®ã‹ã‚‰ setTimeout ãƒã‚¹ãƒˆæ™‚ã®ã‚¹ãƒãƒƒãƒˆãƒªãƒ³ã‚°ãŒç™ºç”Ÿã™ã‚‹ã‚ˆã†ã«ã™ã‚‹ã£ã½ã„: https://chromestatus.com/feature/5710690097561600

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Everything You Need to Know About JavaScript Import Maps
Import maps are a new way for web pages to control the behavior of JavaScript imports, potentially enabling you to ditch your build system. In this article, Ayooluwa Isaiah dives deep into the specification.
mizdra 2022/08/10
javascript

browser
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Ryan Dahl
Dear Oracle, Please Release the JavaScript Trademark2022-09-03 In 1995 Netscape partnered with Sun Microsystems to create interactive websites. Famously Brendan Eich spent only 10 days to create the first version of JavaScript - a dynamic programming language with a roughly syntactic lineage from Sunâ€™s Java language. As a result of this partnership Sun held the trademark â€œJavaScriptâ€. In 2009 Orac
mizdra 2022/05/25
browser

javascript

deno

node.js
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2022å¹´ã«ãŠã‘ã‚‹ãƒ•ãƒãƒ³ãƒˆã‚¨ãƒ³ãƒ‰é–‹ç™ºã®ãƒ™ãƒ¼ã‚¹ãƒ©ã‚¤ãƒ³
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mizdra 2022/02/06
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performance

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Console Utilities API reference Â |Â Chrome DevTools Â |Â Chrome for Developers
The Console Utilities API contains a collection of convenience functions for performing common tasks: selecting and inspecting DOM elements, querying objects, displaying data in readable format, stopping and starting the profiler, monitoring DOM events and function calls, and more. Looking for console.log(), console.error(), and the rest of the console.* functions? See Console API Reference. $_ $_
mizdra 2021/05/03
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JavaScriptã§ã®DOMæ“ä½œã¯é‡ã„ã®ã‹ã¨ã„ã†è©±ã¨Forced Synchronous Layoutã«ã¤ã„ã¦ - id:anatooã®ãƒ–ãƒã‚°
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mizdra 2021/05/03
performance

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JavaScriptã§ä»»æ„ã®HTMLè¦ç´ ã‚’Picture-in-Pictureã™ã‚‹
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mizdra 2021/04/30
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mizdra 2021/03/24
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Intro ã€Œæ–°ã—ã„ API ãªã©ã‚’ã€ã©ã†ã‚„ã£ã¦èª¿ã¹ã¦ã„ã‚‹ã®ã‹ã€ã€Œä»•æ§˜ãªã©ã‚’èª¿ã¹ã‚‹éš›ã«ã€ã©ã“ã‹ã‚‰æ‰‹ã‚’ã¤ã‘ã‚Œã°è‰¯ã„ã®ã‹ã€ãªã©ã¨ã„ã£ãŸè³ªå•ã‚’ã‚‚ã‚‰ã†ã“ã¨ãŒã‚ã‚‹ã€‚ ç¢ºã‹ã«ã©ã“ã‹ã«æ˜Žæ–‡åŒ–ã•ã‚Œã¦ã„ã‚‹ã¨è¨€ã†ã‚ˆã‚Šã¯ã€æ™®æ®µã‹ã‚‰ã‚„ã£ã¦ã„ã¦ã€ã‚ã‚‹ç¨‹åº¦æ…£ã‚Œã¦ãã¦ã„ã‚‹ã ã‘ãªã‚‚ã®ã§ã‚ã‚Šã€è‡ªåˆ†ã¨ã—ã¦ã‚‚æ˜Žæ–‡åŒ–ã—ã¦ã„ãªã‹ã£ãŸãŸã‚ã€ã“ã‚Œã‚’æ©Ÿã«è§£èª¬ã—ã¦ã¿ã‚‹ã€‚ ã‚„ã‚Šæ–¹ã¯ä¸€ã¤ã§ã¯ãªã„ä¸Šã«æ—¥ã€…å¤‰ã‚ã£ã¦ã„ãã ã‚ã†ãŒã€é »ç¹ã«ã“ã®è¨˜äº‹ã‚’æ›´æ–°ã™ã‚‹ã¤ã‚‚ã‚Šã¯ãªã„ã€‚ã¾ãŸã€ç†è€…ã¯å®Ÿå‹™ã§å¿…è¦ã«ãªã‚‹ã¨ã„ã†ã‚ˆã‚Šã¯ã€ã»ã¨ã‚“ã©ã‚’è¶£å‘³ã§ã‚„ã£ã¦ã„ã‚‹ãŸã‚ã€ã“ã®ã‚„ã‚Šæ–¹ãŒåˆã‚ãªã„å ´é¢ã¯å¤šã€…æœ‰ã‚‹ã ã‚ã†ã€‚ ã‚¹ã‚³ãƒ¼ãƒ—ã¨ã—ã¦ã¯ã€ãƒ©ã‚¤ãƒ–ãƒ©ãƒªã€ãƒ„ãƒ¼ãƒ«ã€ãƒ•ãƒ¬ãƒ¼ãƒ ãƒ¯ãƒ¼ã‚¯ãªã©ã§ã¯ãªãã€ Web ãƒ—ãƒ©ãƒƒãƒˆãƒ•ã‚©ãƒ¼ãƒ é–¢é€£ã®æ¨™æº–ã‚„ãƒ–ãƒ©ã‚¦ã‚¶ã®å®Ÿè£…çŠ¶æ³ãªã©ã«é™å®šã—ã¦ã„ã‚‹ã€‚ Scope å¾“æ¥ã‹ã‚‰ã‚ã‚Šã€åºƒãèªçŸ¥ã•ã‚ŒãŸ API ã«ã¤ã„ã¦ã¯ã€æƒ…å ±ã‚‚å¤šãèª¿æŸ»ã®æ•·å±…ã¯ãã“ã¾ã§é«˜ããªã„ãŸã‚ã€ä»Šå›žã¯è°è«–ãŒå§‹ã¾ã£ã¦
mizdra 2020/12/12
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javascript

web

browser
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Better JS scheduling with isInputPending() Â |Â Capabilities Â |Â Chrome for Developers
Loading fast is hard. Sites that leverage JS to render their content currently have to make a trade-off between load performance and input responsiveness: either perform all the work needed for display all at once (better load performance, worse input responsiveness), or chunk the work into smaller tasks in order to rem ain responsive to input and paint (worse load performance, better input respons
mizdra 2020/11/24
performance

javascript

browser
ãƒªãƒ³ã‚¯
ãƒ†ã‚¹ãƒˆç’°å¢ƒ â€“ React
ã“ã®ãƒ‰ã‚ãƒ¥ãƒ¡ãƒ³ãƒˆã§ã¯ã‚ãªãŸã®ç’°å¢ƒã«å½±éŸ¿ã™ã‚‹è¦ç´ ã‚„ã€ã„ãã¤ã‹ã®ã‚·ãƒŠãƒªã‚ªã«ãŠã‘ã‚‹æŽ¨å¥¨äº‹é …ã«ã¤ã„ã¦æ¦‚èª¬ã—ã¾ã™ã€‚ ãƒ†ã‚¹ãƒˆãƒ©ãƒ³ãƒŠãƒ¼ Jestã€mochaã€ava ã®ã‚ˆã†ãªãƒ†ã‚¹ãƒˆãƒ©ãƒ³ãƒŠãƒ¼ã‚’ä½¿ãˆã°ã€æ¨™æº–çš„ãª JavaScript ã‚’ä½¿ã£ã¦ãƒ†ã‚¹ãƒˆã‚¹ã‚¤ãƒ¼ãƒˆã‚’æ›¸ãã€é–‹ç™ºãƒ—ãƒã‚»ã‚¹ã®ä¸€ç’°ã¨ã—ã¦å®Ÿè¡Œã§ãã‚‹ã‚ˆã†ã«ã§ãã¾ã™ã€‚åŠ ãˆã¦ã€ãƒ†ã‚¹ãƒˆã‚¹ã‚¤ãƒ¼ãƒˆã¯ç¶™ç¶šçš„ã‚¤ãƒ³ãƒ†ã‚°ãƒ¬ãƒ¼ã‚·ãƒ§ãƒ³ã®ä¸€éƒ¨ã¨ã—ã¦ã‚‚å®Ÿè¡Œã•ã‚Œã¾ã™ã€‚ Jest ã¯ React ãƒ—ãƒã‚¸ã‚§ã‚¯ãƒˆã¨ã®åºƒç¯„ãªäº’æ›æ€§ã‚’æœ‰ã—ã¦ãŠã‚Šã€ãƒ¢ã‚¸ãƒ¥ãƒ¼ãƒ«ã‚„ã‚¿ã‚¤ãƒžãƒ¼ã®ãƒ¢ãƒƒã‚¯ã€jsdom ã®ã‚µãƒãƒ¼ãƒˆã‚’æœ‰ã—ã¦ã„ã¾ã™ã€‚Create React App ã‚’ä½¿ã£ã¦ã„ã‚‹å ´åˆã€Jest ã¯æœ‰ç”¨ãªãƒ‡ãƒ•ã‚©ãƒ«ãƒˆå€¤ã¨ã¨ã‚‚ã«è¿½åŠ è¨å®šãªã—ã§ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ«ã•ã‚Œã¾ã™ã€‚ mocha ã®ã‚ˆã†ãªãƒ©ã‚¤ãƒ–ãƒ©ãƒªã¯å®Ÿéš›ã®ãƒ–ãƒ©ã‚¦ã‚¶ç’°å¢ƒã§ã†ã¾ãå‹•ä½œã™ã‚‹ãŸã‚ã€ãã‚ŒãŒå¿…è¦ãªãƒ†ã‚¹ãƒˆã§ã¯æœ‰ç”¨ã§ã—ã‚‡ã†ã€‚ End-to-end ãƒ†ã‚¹ãƒˆã¯è¤‡æ•°ã®ãƒšãƒ¼ã‚¸ã«ã¾ãŸãŒã‚‹
mizdra 2020/10/21
React ã®ãƒ†ã‚¹ãƒˆã«åˆ©ç”¨å¯èƒ½ãªç’°å¢ƒã«ã¤ã„ã¦ã€‚jsdom ã‹ã‚‰ãƒ˜ãƒƒãƒ‰ãƒ¬ã‚¹ãƒ–ãƒ©ã‚¦ã‚¶ã¾ã§ã€‚

testing

javascript

browser
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jsdom vs. PhantomJS
mizdra 2020/10/21
DOM API ã‚’åˆ©ç”¨ã™ã‚‹ã‚³ãƒ¼ãƒ‰ã‚’ãƒ†ã‚¹ãƒˆã™ã‚‹æ–¹æ³•ã¨ã—ã¦ã€jsdom ã‚’ä½¿ã†æ–¹æ³•ã¨ å®Ÿãƒ–ãƒ©ã‚¦ã‚¶ (ã“ã“ã§ã¯PhantomJSã«é™ã£ãŸè©±ã ã‘ã©) ã‚’ä½¿ã†æ–¹æ³•ã®2ç¨®é¡žãŒä¸»ã«ã‚ã‚‹ã‘ã©ã€ãã‚Œãžã‚Œã©ã†é•ã†ã®ã‹ã€ã¨ã„ã†ã®ãŒèª¬æ˜Žã•ã‚Œã¦ã„ã‚‹ã€‚

testing

javascript

browser
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Script Error â€” Javascript Solution with Sample Code | Sentry
The Probl em Script error. â€œScript errorâ€ is what browsers send to the onerror callback when an error originates from a JavaScript file served from a different origin (different domain, port, or protocol). Itâ€™s painful because even though thereâ€™s an error occurring, you donâ€™t know what the error is, nor from which code itâ€™s originating. And thatâ€™s the whole purpose of window.onerror â€“ getting insig
mizdra 2020/10/10
javascript

web

security

cors

browser
ãƒªãƒ³ã‚¯
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mizdra 2020/09/20
jest

testing

javascript

browser
ãƒªãƒ³ã‚¯
Webã‚¢ãƒ•ã‚šãƒªã‚±ãƒ¼ã‚·ãƒ§ãƒ³ã¦ã‚™ 60fpsã‚’(æ¥µåŠ›)ç›®æŒ‡ã™
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mizdra 2020/08/22
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performance

web

css

javascript

animation

browser
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Google Chromeã«ãƒãƒƒãƒ†ãƒªå‹•ä½œã‚’2æ™‚é–“å»¶ã°ã™è©¦é¨“çš„æ©Ÿèƒ½
mizdra 2020/07/07
ãƒžã‚¸ã‹ / â€œJavaScriptã‚¿ã‚¤ãƒžãƒ¼ã‹ã‚‰ã®ã‚¦ã‚§ã‚¤ã‚¯ã‚¢ãƒƒãƒ—ã‚’ã€1åˆ†ã‚ãŸã‚Š1å›žã«ãªã‚‹ã‚ˆã†ã«åˆ¶é™ã—â€

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WPTã‚’Chromeã§å®Ÿè¡Œã—ã¦HTML5 APIã‚’ç†è§£ã™ã‚‹ - Qiita
WPTã¨ã¯ WPT (web-platform-tests)ã¨ã„ã†ã€ãƒ–ãƒ©ã‚¦ã‚¶ã‚’ä½œã£ã¦ã„ã‚‹äººã®ãŸã‚ã®ãƒ†ã‚¹ãƒˆã‚¹ã‚¤ãƒ¼ãƒˆãŒã‚ã‚‹ã€‚ã“ã‚Œã¯ã€ãƒ–ãƒ©ã‚¦ã‚¶ãŒã©ã†å‹•ãã¹ãã‹ã‚’å®šç¾©ã—ã¦ã„ã‚‹æ§˜ã€…ãªWebæ¨™æº–ã‚’ã€å„ãƒ–ãƒ©ã‚¦ã‚¶ãŒæº€ãŸã—ã¦ã„ã¦ã‚‹ã‹ã‚’ç¢ºèªã™ã‚‹ãŸã‚ã®ãƒ†ã‚¹ãƒˆãªã®ã ãŒã€Webã‚µã‚¤ãƒˆã‚’ä½œã£ã¦ã„ã‚‹Webãƒ‡ãƒ™ãƒãƒƒãƒ‘ãƒ¼ãŒæ–°ã—ã„Webã®APIã‚’ã©ã†ä½¿ã£ãŸã‚‰ã„ã„ã‹ã‚’èª¿ã¹ã‚‹ã¨ãã«ã‚‚å½¹ç«‹ã¤ã¨æ€ã†ã€‚ ã¨ã„ã†è©±ã‚’ã€é›»è»Šã§æ¨ªã«åº§ã£ã¦ã„ãŸã¨ã‚ã‚‹äººã«è©±ã—ãŸã‚‰ã€Œã˜ã‚ƒã‚ã€ã‚„ã‚Šæ–¹ã‚’(æ—¥æœ¬èªžã§)ç´¹ä»‹ã—ã¦ãã ã•ã„ã‚ˆã€‚ã€ã¨è¨€ã‚ã‚ŒãŸã®ã§ã€ç°¡å˜ã«ç´¹ä»‹ã—ãŸã„ã€‚ æ‰‹è»½ã«è©¦ã™ æ‰‹è»½ã«è©¦ã—ãŸã‘ã‚Œã°ã€https://w3c-test.org ä»¥ä¸‹ã«ã‚ã‚‹ç›®çš„ã®ãƒ†ã‚¹ãƒˆãƒ•ã‚¡ã‚¤ãƒ«ã‚’é–‹ãã¨ã„ã„ã€‚ ä¾‹ãˆã°ã€Service Worker Navigation Preloadã®ãƒ†ã‚¹ãƒˆã§ã‚ã‚Œã° https://w3c-test.org/service-workers/service
mizdra 2020/07/04
browser

test

web

html

javascript

css
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