JavaScript Test

I am experimenting with Chrome DevTool's beautiful Workspaces / in-devtools code editor in the … Read more Chrome Developer Tools: How To Disable Code Auto Complete?

I tried the following code in the Google Chrome console and I’m getting this output. Why is there a… Read more Why Does This `do`–`while` Loop Repeat The Last Value After The End?

Simplified, what I'm doing is running this in the console: window.onbeforeunload = function (e)… Read more Why Can't I Expand This Event Object In The Chrome Console?

Google Chrome have the option 'Save as PDF' when you enter the Print dialog or window.print… Read more Javascript Call Programmatically The "save As Pdf" Feature Of Chrome Dialog Print

I work with Angular and RequireJS. I tried to use RequireJS optimization, and now my application is… Read more How To Use Source Map To Find Minification Error

I am surprised that the following code when input into the Chrome js console: {} instanceof Object … Read more Uncaught Syntaxerror: Unexpected Token Instanceof (with Chrome Javascript Console)

I noticed something odd in the Memory inspector of both Chrome and Firefox. On a large page, it wil… Read more Where Can I Find The Real Memory Use Of A Page (including Images And Multimedia)?

Here is My code, var myExtension = chrome.management.get( 'my_extention_id' ); if (myExtens… Read more Getting Error While Detect Chrome Extension Installed Or Not Using Javascript

Is there a way to record a performance timeline for tests run with Puppeteer? Solution 1: Yes, jus… Read more Puppeteer Performance Timeline?

I don't use any remote debug(webstorm and devtools) just use chrome devtools when debug stop in… Read more Chrome Devtools Debug React, Hit "refresh" Cause Debug Stuck

Possible Duplicate: Is JavaScript’s Math broken? I noticed a weird behavior when I try to run 4.0… Read more Result Of 4.08-1.36 In Console

I am creating a chrome extension that needs to inject a floating element (i.e position:fixed) at th… Read more How Can A Chrome Extension Add A Floating Bar At The Bottom Of Pages?

I'm trying to debug a JavaScript onFocus event attached to a bunch of text boxes on a page. Th… Read more Debugging Onfocus Event Using Chrome Developer Tools? Can't Return Focus After Break Point

It clearly has something to do with how long the function takes, what specifically does it represen… Read more What Is The Time That's Shown In A Column Next To Javascript In The Chrome Developer Tools?

In React when things go wrong you often wind up with A LOT of error messages in your console. Some… Read more In Chrome/firefox Developer Tools, Is It Possible To Hide All But The First Two Errors? (since React Gives Lots Of Garbage Errors)

I seem to have stumbled upon an inconsistency in Chrome DevTools. Above is a screenshot from the D… Read more Chrome Devtools - Inconsistent Array Length

I tried to trace back which function hooked into a click event of .someclass. I open Chrome Dev Too… Read more How To Use Geteventlisteners In Chrome Dev Tool?

I would like to change the tooltip text of of Chrome's Element Inspector. (The one you see with… Read more How To Change Text Of Element Inspector Tooltip/highlight Via Chrome Extension?

I'm trying to reverse engineer a heavily obfuscated JS and one of the tricks the author does is… Read more Is It Possible To Avoid Breaking On A Debugger Statement In Chrome?

OS: Windows 10 Pro x64-based PC node -v: v8.12.0 npm list puppeteer: `-- puppeteer@1.9.0 I tried t… Read more How To Set, Change Or Block Timezone(systemtime) With Puppeteer?