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Text of the page (random words):
javascript devtools tips skip to main content close menu devtools tips guides understanding devtools tips by category accessibility apps console css debug export frameworks help highlighter html javascript network perf personalization productivity testing webcomponents tips by browser chrome edge firefox polypane safari all tips open menu github repository mastodon social account 25 javascript tips name evaluated files with the sourceurl pragma if you insert javascript code in a webpage by using the eval function or inline script tags you can use the sourceurl pragma to give them a name in devtools for example when using eval read more categories javascript debug supported by edge chrome firefox safari force execution skipping breakpoints when paused when using breakpoints to debug your javascript code sometimes you end up setting many breakpoints in different functions you might want to keep these breakpoints but not always pause at them there read more categories debug javascript supported by edge chrome firefox detect unused css and javascript code to make sure your webpage loads and appears fast for your users load only the css and js code that your page requires to appear correctly if some of your css or js code is only needed later when th read more categories perf css javascript supported by edge chrome safari disable abusive debugger statements that prevent inspecting websites some websites make it impossible to use devtools by adding debugger statements in their code the statements don t do anything for normal users but as soon as devtools is opened the javascript execu read more categories javascript debug supported by firefox chrome safari edge manipulate global objects on page load before other scripts run when a page loads and all of its global objects are ready but before the javascript code of the page actually kicks in is a great time to inject debugging code for example it might be useful to r read more categories debug javascript supported by safari re use scripts as snippets the console is great to write short javascript expressions that read from the document or manipulate it but it s also a terrible editor you can actually use a full editor in edge chrome and safari read more categories javascript supported by edge chrome safari ignore javascript code to ease debugging debugging javascript can quickly get out of hand when you have a lot of code and many functions that call each other what s even worse is when a lot of this code isn t even yours this can happen whe read more categories javascript frameworks supported by edge chrome firefox edit javascript functions while debugging to test a quick fix sometimes when debugging javascript code in devtools you may want to test a quick change and see whether that fixes the bug usually this involves the following steps pause at a breakpoint or an read more categories javascript supported by edge chrome copy an element s javascript path javascript often needs references to dom nodes on the page getting a reference is sometimes easy with document getelementbyid or similar other times however a more complicated css selector needs read more categories javascript testing supported by edge chrome manipulate complex json files using devtools i often work with large amount of data that i need to go through and gather interesting information from sometimes this data is in json format when that s the case i like using devtools to turn it read more categories javascript supported by edge firefox chrome detect the element with focus at any time if you want to know which element has the focus on the web page at any time you can use a live expression in the console tool open the console click the create live expression button it looks lik read more categories console javascript supported by edge chrome remove or disable event listeners when you re trying to debug something and event listeners on the page keep interfering with what you re doing it can be frustrating imagine a mousemove event listener that changes some of the inform read more categories javascript supported by firefox edge chrome copy a css rule as css in js format do you use a css in js framework if so you know how frustrating it can be to copy css from devtools and paste it into your code indeed if the css you worked on in the styles panel looks like this read more categories css javascript frameworks supported by edge chrome automatically logging name and value in console log using the console of devtools you can to log some information to debug your javascript the common way to do that is to add a console log statement where you want to learn the value of a certain var read more categories console javascript supported by edge chrome firefox safari polypane cut down on console noise using live expressions using the console of devtools to log information that changes a lot is a bad idea first of all you flood it with information secondly it can impact the performance of your product and last but no read more categories debug javascript supported by edge chrome console log for the web with logpoints using the console to log some information is a very common way to debug your javascript but you can also log information in any web site using logpoints in the sources panel here s how to do it i read more categories debug javascript supported by edge chrome firefox safari pause script execution when the dom changes if you want to know what javascript code removes adds or modifies a dom element in the page you can use dom breakpoints in devtools you can choose to break on subtree modification this pauses e read more categories javascript debug supported by firefox chrome edge safari play a sound when a line of javascript is executed sometimes pausing execution when a line of javascript is executed is too much sometimes you only want to know that the line was executed at all not pause there to do this you can add console log read more categories debug javascript supported by safari capture node creation stack traces have you ever wanted to know what caused a specific dom node or element to be created in the page when working on a site that uses a lot of javascript and especially when you don t know the codebase read more categories javascript supported by edge chrome event listeners are suppressed when paused this is not really a tip but rather an interesting thing to be aware of when debugging javascript if you use breakpoints in the sources or debugger tab in devtools to debug javascript you should read more categories javascript supported by firefox edge chrome safari copy an object from the console the console panel supports a very handy copy function that stringifies and copies anything you pass to it as an argument so you can then paste it somewhere else for example copy a map a g read more categories console javascript supported by edge firefox chrome safari find your web component s custom element code in firefox when inspecting elements in the inspector panel you can click on the custom badge to go straight to the custom element s javascript source code read more categories webcomponents javascript supported by firefox view performance markers in order when logging performance timing events to the console they appear in alphabetical order since they are properties of the performancetiming object in order to view them in order you can use console read more categories javascript perf console supported by edge chrome safari unminify javascript code to easily read and debug it sometimes the javascript code that runs on a website is minified and really hard to read this is common in production you can unminify code in devtools to read it more easily and also set breakpoi read more categories javascript debug supported by firefox chrome edge safari use the debugger statement to pause script execution if you prefer to use console log statements rather than the javascript debugger because you find it difficult to set breakpoints in devtools or you can t then you can use the debugger statement i read more categories javascript debug supported by firefox chrome edge safari