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ector tool you can delete nodes from the dom tree by selecting them in the tool and then pressing delete or backspace while this is great to completely remove the read more categories personalization css supported by edge chrome firefox polypane pick a color from the webpage or the screen when working with the css of a webpage from the elements or inspector tool in devtools there may be times when you want to reuse a existing color from the webpage or from the screen but might not read more categories css supported by edge chrome firefox safari polypane highlight areas that the browser engine re paints when you scroll through a webpage or when parts of the webpage change the browser engine sometimes needs to repaint parts of the page the process of converting the layout and style information into read more categories perf highlighter supported by edge chrome safari display the specificity of a css selector the specificity of a css selector is a score that the browser computes based on the different parts of the selector it is used to determine which css rule takes precedence when multiple rules from th read more categories css supported by chrome edge safari polypane firefox copy an inline svg image s source code to copy the svg source code of an svg image that s embedded directly in the html of a webpage use the elements tool in devtools inspector in firefox to open devtools right click the svg image i read more categories export supported by edge chrome firefox safari polypane 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 find why a css property is overridden in css the cascade plays a very important role in which css properties apply to an element this key concept is not explained here but you can learn more on mdn at cascade specificity and inherit read more categories css debug supported by edge chrome safari firefox see the accessibility tree the accessibility tree is a representation of the structure of a web page that is used by assistive technologies such as screen readers it is similar to the dom tree but it only includes the element read more categories accessibility supported by edge chrome firefox 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 simulate the window controls overlay feature for pwa if you re building a desktop pwa you might want to use the window controls overlay wco feature to make your app look more native with wco you gain control over the entire surface area of the inst read more categories css apps supported by edge chrome inspect the user agent dom browsers often add elements to the dom of your web pages on top of the ones you yourself defined for example when you create a video element the browser creates a bunch of nested dom node read more categories html webcomponents supported by edge chrome firefox safari explain console errors by using artificial intelligence edge devtools lets use the microsoft copilot ai assistant to explain errors and warnings in the console tool console errors can sometimes be hard to understand and fix the large language models that read more categories console help supported by edge block devtools there are two levels to consider when talking about blocking or disabling devtools in a browser disabling devtools at the browser level for example if you have a browser for web development and read more categories help supported by chrome edge safari firefox list all event listeners on the entire page when you don t know a codebase it might be hard to know where to get started and what events are being listened to by which elements the console tool in chromium based browsers comes with a nice read more categories console debug supported by edge chrome safari debug popups that appear on hover as described in debug popups that appear on hover using js and in debug popups that appear on hover using the debugger statement there are ways to debug popups that appear on hover using javascript read more categories debug supported by edge chrome polypane 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 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 convert images to data urls a data url is a url that starts with the prefix data instead of http or https this data prefix or scheme allows you to embed the actual content of the resource in the url itself rather than lin read more categories productivity supported by edge chrome firefox polypane use user gesture restricted apis in the console certain web apis are user gesture restricted this means that they can only be called as a result of a user action such as in a click event handler for example you can t simply put yout website in read more categories console supported by edge chrome safari highlight all elements on the page that match a given css selector when you select an element in devtools in the elements or inspector tool you see the css rules that apply to it but these rules can also apply to other elements in the page than the currently sel read more categories highlighter css supported by firefox chrome edge 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 customize the way objects look in devtools objects appear in many places in devtools most commonly in the console tool but also in various parts of the sources or debugger tool when you debug javascript code devtools is the one that decid read more categories personalization frameworks supported by edge firefox chrome inspect devtools with devtools the user interface of devtools is built with html css and javascript this means you can inspect and debug devtools with devtools chromium to debug devtools in chromium based browsers such as ch read more categories personalization productivity supported by edge chrome firefox create your own devtools theme you can change the color theme of devtools to match your preference see change the color theme of devtools to learn more but you can also create your own theme from scratch by creating a browser ex read more categories personalization supported by edge chrome find memory leaks by comparing heap snapshots note if you think your memory leak comes from dom nodes you can also use the detached elements tool in edge see get detached dom elements to investigate memory leaks memory leaks are hard to find read more categories perf supported by edge chrome add custom headers to the network table on the web when a client a browser and a server communicate using http the requests and responses they send to each other contain headers these headers are key value pairs that contain metadata a read more categories network supported by edge chrome find the css rule that causes a specific style to apply here is the scenario you know there s a specific style that applies to an html element in your web page say some padding but you can t seem to find where in the css code that style is coming from read more categories css debug supported by firefox edge chrome safari understand when the console opens in the main panel and in the drawer have you noticed how the console tool is sometimes displayed in a top level tab just like all other tools and sometimes in a split pane at the bottom below the main tool if you ve been confused b read more categories help personalization console supported by edge chrome 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 inspect and debug iframes if the page you are working on contains an iframe which you want to inspect and debug you can actually use devtools to do so this can be very useful when working with coding playground sites like co read more categories debug supported by edge chrome firefox safari take high resolution screenshots of web pages taking screenshots of all or parts of web pages is super useful scroll down to the see also part at the bottom of this page for more tips on that but sometimes the resulting screenshots aren t hig read more categories export supported by firefox chrome edge customize the columns shown in console table the console table method is great for displaying tabular data in the console but what if the objects your re logging contain a lot of properties causing a lot of columns to appear in the console fo read more categories console supported by edge firefox chrome safari polypane speed up or slow down a video you can speed up or slow down a video on a website by using the playbackrate property of the video element this can be very useful for when the website makes it tricky to do this in the ui open dev read more categories console personalization 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 replay a xhr request when you re debugging an xhr request to a backend service that doesn t respond with the right things it can be useful to send the request over and over again reloading the entire page to do so is ted read more categories network supported by chrome edge list the fonts used on a page or an element what font is that or why is this font used are probably questions you ve asked yourself while working on a website design however it s not always easy to know which fonts a read more categories css supported by edge chrome firefox polypane see network request paths instead of names in the network tool by default the network tool displays the name of each requested resource for example if a webpage requests an image from https mysite com assets img image png then the tool only displays image pn read more categories network supported by edge chrome firefox display the current framerate of your webpage for a super smooth user experience on your website or app it s better if the browser manages to render your page at a high framerate ideally this rate should be 60 frames per second fps this giv read more categories perf supported by edge chrome 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 throttle your cpu your development machine is very likely much more powerful than the devices your users have which are probably low end mobile devices before you ship your new app or site thinking that it will run read more categories perf supported by edge chrome see the size of the transferred data for images scripts or other resources to know how much data your website transfers between the server and the client to display images or scripts or anything else open the network tool refresh the page to make sure the list of req read more categories network perf supported by edge chrome firefox safari view console logs from non safari browsers on an iphone using the about inspect special page you can see your website s logs in chrome or edge running on iphone this is important because debugging a webpage that s running in safari on an iphone isn t hard read more categories debug console supported by edge chrome 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 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 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 see formatted json responses edge starting with 110 firefox and polypane all have a very nice json viewer tool that makes it easy to view json responses from your server directly in the browser window you don t even need to o read more categories network supported by firefox edge polypane debug unwanted scrollbars scrollbars can sometimes appear on a webpage unexpectedly when this happens finding which html element is the cause of the scrollbars isn t always straightforward devtools provides features that he read more categories css supported by firefox safari chrome edge polypane find the most expensive css selectors when it comes to improving web rendering performance we often spend time working on javascript code but css has an important role to play too in how fast a web page renders css selectors in partic read more categories css perf supported by edge chrome list all supported console functions you ve probably already used console log in your code to print debugging values to the console tool in devtools but the console namespace actually has many other functions too to list them all op read more categories console supported by 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