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testing 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 29 testing tips create a web server to test local files use firefox s local mode to test local files without having to set up a web server certain web apis require to use a web server to work properly for example navigator clipboard requires a secure co read more categories testing productivity supported by firefox override network responses with local files to test a quick fix locally in devtools without editing the source file and deploying it to a server override network responses with local files firefox open the network tool find the reque read more categories network testing supported by edge chrome firefox override source files to test changes in the browser it can be helpful to make quick changes to the source code that a site uses especially when debugging a site in production for example if you suspect that a bug is caused by a specific line of code read more categories debug testing supported by edge chrome firefox override http response headers with devtools you can override the response headers of a network request and test your website under different conditions http response headers are metadata sent by the server to the browser along read more categories network testing supported by edge chrome disable all css styles on the page to remove all css styles on a webpage for example to test the accessibility of a page when styles are disabled or to verify the order in which content is displayed you can use the techniques below read more categories css testing supported by edge chrome firefox safari polypane see the viewport size the size of the viewport that s used to render a webpage in a browser can be very important at times such as when creating or debugging media queries you can easily know what the current size of the read more categories debug testing css supported by edge chrome firefox safari polypane check if a website uses third party cookies cookies are small files that websites save on your computer when you visit them websites often use cookies to remember things about your last visit for example a weather website can use cookies to read more categories testing network supported by chrome edge firefox safari find all elements with a specific style let s say you want to list all of the elements on a page that are absolutely positioned or maybe you want to find all of the elements that use css grid how would you do that one way is to run a few read more categories css console testing supported by edge chrome firefox safari polypane debug your print css styles by simulating print media if you work on a webpage that s supposed to be printed you probably want to test your print css styles you can use your browser s print preview of course but what if you need to debug the css devt read more categories css testing supported by edge chrome firefox polypane safari find broken links the link to x on page y doesn t work is probably a bug report you ve received at some point but how do you find these broken links before someone else does in polypane the outline panel will show y read more categories testing supported by polypane emulate color schemes in css you can use the prefers color scheme media feature docs to detect if the user prefers using a light or a dark theme in their operating system this is useful to style your website in a way t read more categories css testing supported by edge chrome safari firefox polypane simulate multiple devices that are kept in sync instead of simulating devices one by one and switching between them polypane supports testing on multiple simulated devices and viewports at the same time it lets you test different simulated device read more categories productivity testing supported by polypane show web vitals web vitals are a set of metrics that help you determine how well built your page is you can learn more about them here these scores can be obtained with various online checks like pagespeed insights read more categories perf testing supported by polypane autofill forms for testing in polypane you can right click any form on the page and select autofill form to add dummy values to all input elements this prevents you from having to go field by field to fill in all required fiel read more categories productivity testing supported by polypane test your pwa protocol handlers progressive web apps pwa can register themselves to handle uris with pre defined or custom protocols such as mailto geo or web foo this is a great capability that makes it possible for installe read more categories testing apps supported by edge chrome emulate idle detection states the idle detection api is useful for web developers to detect when the user isn t interacting with their device this can be useful for chat applications for example to mark the user as away note read more categories testing supported by chrome simulate different devices and screen sizes all browser devtools have a built in mode that you can use to test a webpage under different screen sizes and device capabilities as a web developer it is very important to realize that your website read more categories testing supported by edge firefox chrome safari polypane simulate a different latitude longitude geolocation if your website has features that depend on the geographic location of your users you can test these features by simulating different geolocations right from devtools chrome and edge devtools have a read more categories testing 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 empty the cache and hard refresh here is a nice tip to quickly empty your cache and refresh the page in order to test new code changes in chrome or edge open devtools f12 this step is not needed for polypane right click on t read more categories network productivity testing supported by chrome edge polypane create your own simulated devices you can simulate various different devices from devtools to get an idea of how your webpage might render on those devices note that this is only a simulation the tool only changes the screen dimens read more categories testing supported by chrome edge firefox polypane use document designmode to spell check your webpage amelia bellamy royds shared a really cool tip to spell check a webpage s content from devtools open devtools and go to the console tool type document designmode on and press enter c read more categories console productivity testing supported by edge firefox chrome safari polypane automatically get issues your site has with performance accessibility security compatibility and others edge has a very useful issues panel that can automatically list a lot of different issues with your site it can detect common issues related to browser compatibility accessibility performance secu read more categories accessibility perf testing supported by edge start your html and css prototypes in the browser directly sometimes i need a blank canvas to prototype an idea with html and css something outside of the website i m working on maybe i need a new layout or component and i m not sure yet how to do it in th read more categories css html testing supported by edge chrome firefox safari use full browser window for device emulation emulating different devices in the browser is incredibly useful it gets tricky when you are on a device with limited resolution as the emulated device needs to be zoomed down to fit the screen as a l read more categories testing productivity supported by edge chrome firefox polypane record and replay user flows sometimes you need to repeatedly test the same user scenario on a website this can happen when working on a fix or a performance improvement testing the same user scenario over and over again requi read more categories testing perf supported by chrome edge evaluate xpath to find elements in the page devtools supports 2 ways to evaluate xpath expressions to help you locate elements in the page all browsers support those 2 ways from the elements or inspector panel click anywhere in the panel read more categories html testing supported by edge chrome firefox safari block resources to test your site without css or javascript the various resources loaded by your site aren t always guaranteed to reach your users when they visit your site network problems can occur javascript may be disabled a cdn may be down or the brow read more categories network testing supported by edge chrome firefox copy an element s xpath expression you can easily copy an element s xpath expression from devtools this is useful if you need this expression for an automated test for example go to the elements or inspector panel use the context read more categories html testing supported by edge chrome firefox safari
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