After a lot of digging, I found that this has been reported as a bug, fixed in Webkit, but apparently not yet pulled into Google Chrome. As far as I can tell, the issue was originally reported here: https://bugs.webkit.org/show_bug.cgi?id=35801 : Description From mitch kramer 2010-03-05 11:37:45 PST 1) create an object literal with one or … Read more
Hit F12 to open Dev Tools Click the Sources tab On right-hand side, scroll down to “Event Listener Breakpoints”, and expand tree Click on the events you want to listen for. Interact with the target element, if they fire you will get a break point in the debugger Similarly, you can right click on the … Read more
Note: This answer covers several versions of Chrome, scroll to see v52, v48, v46, v43 and v42 each with their updated changes. Chrome v52+: Open the Developer Tools (Windows: F12 or Ctrl+Shift+I, Mac: Cmd+Opt+I) Click the Customize and control DevTools hamburger menu button and choose More tools > Rendering settings (or Rendering in newer versions). … Read more
Your problem can be simplified to: /*1.*/ var fourmTabs = []; /*2.*/ chrome.tabs.query({}, function(tabs) { /*3.*/ fourmTabs[0] = tabs[0]; /*4.*/ }); /*5.*/ console.log(fourmTabs[0]); You expect that the fourmTabs array is updated (by line 3) when line 5 is reached. That is wrong, because the chrome.tabs.query method is asynchronous. In an attempt to make you understand … Read more
requestAnimationFrame (Late 2019) Leaving these previous answers here for historical context. Currently Muhammad Umer’s approach works on Chrome 78, with the added advantage of detecting both close and open events. function toString (2019) Credit to Overcl9ck‘s comment on this answer. Replacing the regex /./ with an empty function object still works. var devtools = function() … Read more
The Problem: DOM Requires <tbody/> Tags Firebug, Chrome’s Developer Tool, XPath functions in JavaScript and others work on the DOM, not the basic HTML source code. The DOM for HTML requires that all table rows not contained in a table header of footer (<thead/>, <tfoot/>) are included in table body tags <tbody/>. Thus, browsers add … Read more
If Chrome DevTools is reporting a 404 for a .map file (maybe jquery-1.10.2.min.map, jquery.min.map or jquery-2.0.3.min.map, but can happen with anything) first thing to know is this is only requested when using the DevTools. Your users will not be hitting this 404. Now you can fix this or disable the sourcemap functionality. Fix: get the … Read more
You can use $x in the Chrome javascript console. No extensions needed. ex: $x(“//img”) Also the search box in the web inspector will accept xpath
The resource could be being blocked by an extension (AdBlock in my case). The message is there because the request to retrieve that resource was never made, so the headers being shown are not the real thing. As explained in the issue you referenced, the real headers are updated when the server responds, but there … Read more
In Chrome & Firefox (+31) you can add CSS in console.log messages: console.log(‘%c Oh my heavens! ‘, ‘background: #222; color: #bada55’); The same can be applied for adding multiple CSS to same command. References MDN: Styling console output Chrome: Console API Reference