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debug 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 23 debug tips 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 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 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 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 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 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 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 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 find inactive css styles sometimes we write css code that s entirely valid but has absolutely no effect at all and this can be frustrating indeed there are many cases where a css declaration has no effect on an element on read more categories css debug supported by firefox edge chrome debug popups that appear on hover using the debugger statement in debug popups that appear on hover using js we described how to pause the debugger to inspect popups that appear on hover and disappear as soon as the cursor moves away here s another way to do thi read more categories debug supported by edge chrome safari firefox simulate pseudo css classes if you use hover active or other pseudo classes in your css code it can be tedious to test them for example having to hover over an element which is styled with the hover pseudo class means th read more categories html css debug supported by edge firefox chrome 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 debug popups that appear on hover using js have you ever been frustrated because you couldn t style a popup or tooltip that appeared on hover if it uses javascript to get displayed it s hard to style without modifying the code to make it sta read more categories debug supported by edge chrome safari firefox monitor all events dispatched on an element you can use the monitorevents global function in the console panel to log all of the events dispatched on a particular element select an element in the elements panel go to the console type monito read more categories console debug supported by edge chrome 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 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