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  1. Runtime error reporting: ErrorEvent.

    Unhandled exceptions trigger the 'window.onerror' callback (or 'self.onerror' inside Workers) for centralized handling.

    http://www.w3.org/html/wg/drafts/html/master/webappapis.html#runtime-script-errors

    82 votes
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      2 comments  ·  JavaScript  ·  Flag idea as inappropriate…  ·  Admin →
    • Show syntax errors in debugger

      This feature would expose syntax errors to a developer who has a file open in the F12 debugger.

      Proposed Design
      - If a JavaScript file containing syntax errors is opened in the debugger the syntax error will have a red squiggle and there will be a warning glyph in the gutter

      209 votes
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        0 comments  ·  F12 Developer Tools  ·  Flag idea as inappropriate…  ·  Admin →
      • Resource Priorities

        Defines a means for site developers to programmatically give the User Agent hints on the download priority of a resource.

        http://www.w3.org/TR/resource-priorities/

        80 votes
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          1 comment  ·  Performance  ·  Flag idea as inappropriate…  ·  Admin →
        • Edit and Continue

          This feature would add the ability to edit JavaScript code when stopped in the debugger then to continue (or step) and execute the modified code.

          Proposed Design
          - Will have a number of limitations (e.g. not applicable to eval code)
          - Will not modify the state of the DOM/Objects/Closures etc.

          174 votes
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            3 comments  ·  F12 Developer Tools  ·  Flag idea as inappropriate…  ·  Admin →

            We’ve started work on edit and continue in the F12 debugger. It’s going to take us a while as it’s a complex feature with many moving parts. The first part we’ll tackle is applying changes when you’re not at a breakpoint. So you could do something such as editing an event listener then trigger the event again. No dates for when, or if, we’ll be able to deliver it.

          • Dock tools vertically

            This feature would add the ability to dock F12 to the left side of the IE window.

            Proposed Design
            - Extend the current horizontal explorer bar system that F12 uses to cover the vertical scenario
            - Additional dropdown for docking to indicate the different options (right, bottom, left)
            - No top docking as the explorer bar system doesn't support it (and it's less important as windows are commonly side by side not bottom to top)
            - Not mirrored (i.e. no support for RTL)
            - Each tool in F12 will have to adjust their layout to cope with the change

            160 votes
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              18 comments  ·  F12 Developer Tools  ·  Flag idea as inappropriate…  ·  Admin →
            • Karaoke Web Standard

              Provides semantic language processing for two-way communication with a remote host. This new interface creates a system-to-system forced sonic recognition on the receiving party.

              https://pages.adrianba.net/karaoke/

              72 votes
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                3 comments  ·  Networking  ·  Flag idea as inappropriate…  ·  Admin →
              • Navigation Error Logging

                This specification defines an interface to store and retrieve error data related to the previous navigations of a document.

                https://dvcs.w3.org/hg/webperf/raw-file/tip/specs/NavigationErrorLogging/Overview.html

                68 votes
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                  1 comment  ·  Networking  ·  Flag idea as inappropriate…  ·  Admin →
                • Generated Content for Paged Media

                  CSS properties helpful for printed publication.

                  Spec: http://dev.w3.org/csswg/css3-gcpm/

                  70 votes
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                    1 comment  ·  CSS  ·  Flag idea as inappropriate…  ·  Admin →
                  • Canvas2D text decoration

                    Add a textDecoration attribute to canvas 2D contexts, behavior similar to existing "font" attribute: It's a DOMString, parsed the same way as corresponding CSS property (text-decoration).

                    http://www.w3.org/html/wg/drafts/2dcontext/html5_canvas/#textmetrics

                    48 votes
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                      0 comments  ·  Graphics  ·  Flag idea as inappropriate…  ·  Admin →
                    • Force Active and Focus Pseudo States

                      This feature would add the ability to set the focus and active pseudo states from the DOM Explorer pseudo state checkboxes.

                      Proposed Design
                      - New checkboxes on the pseudo state toggles
                      - Would not fire any JavaScript events (e.g. focus, blur)
                      - Force on only no force off (off toggle state will follow browser default)

                      78 votes
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                        2 comments  ·  F12 Developer Tools  ·  Flag idea as inappropriate…  ·  Admin →
                      • XHR Replay

                        This feature allows users to replay previosly made XHR requests.

                        Proposed Design
                        - Provide a replay button to enter "Edit request mode"
                        - Provide a context menu option on captured XHR requests to enter "Edit request mode"
                        - Provide a "Edit request mode" where users can modify and re-send previously made XHR requests

                        46 votes
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                          1 comment  ·  F12 Developer Tools  ·  Flag idea as inappropriate…  ·  Admin →
                        • Call stacks for messages

                          This feature would add a (expandable) view of the call stack associated with a console message (where applicable e.g. console.log) with each frame being a hyperlink to the relevant source location.

                          Proposed Design
                          - Expando after the current source location string (Default collapsed)
                          - When expanded each frame would be shown as a new line (in order) underneath the source location (which is the top frame)

                          47 votes
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                            2 comments  ·  F12 Developer Tools  ·  Flag idea as inappropriate…  ·  Admin →
                          • Ruler tool

                            This feature would add a ruler tool to the DOM Explorer which would be used to draw an arbitrary ruler on the page to measure the distance between two points.

                            Proposed Design
                            - New command on the DOM Explorer
                            - Only one ruler can be drawn on the page at a time
                            - Activating the command clears the previous ruler from the page and sets the mouse to draw mode where the first click places the first point and then draws a line to the current mouse pointer location. While moving the mouse cursor, a label should be drawn next…

                            32 votes
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                              0 comments  ·  F12 Developer Tools  ·  Flag idea as inappropriate…  ·  Admin →
                            • Highlight find matches in DOM Explorer

                              This feature would improve the find experience in the DOM Explorer to highlight the matching string in the DOM Tree.

                              Proposed Design
                              - Find in the DOM Explorer highlights string match by highlighting the background of the text in blue (to match the debugger)
                              - Highlight find matches in the DOM Explorer gutting with a blue glyph (to match the debugger)
                              - Change the DOM Explorer to highlight as you type
                              - Enter, F3 and Shift + F3 to continue to execute and navigate search matches
                              - Add a progress indicator while executing a find operation

                              25 votes
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                                0 comments  ·  F12 Developer Tools  ·  Flag idea as inappropriate…  ·  Admin →
                              • Locals in Async callstacks

                                This feature would add the ability to view locals when changing the debugger context to an async frame.

                                Proposed Design
                                - The content would be read only (more like a snapshot)
                                - The content would only include to items on the stack for that frame (not all globals)

                                17 votes
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                                  0 comments  ·  F12 Developer Tools  ·  Flag idea as inappropriate…  ·  Admin →
                                • Advanced filtering in network inspector

                                  Proposed Design
                                  - Provide input box inside the type filter menu
                                  - Allow users to type a subset of the URL to filter the captured network traffic
                                  - Allow users to enter a key:value pair combination to filter the captured network traffic. The following are possible keys to be supported
                                  - CookieDomain
                                  - CookieName
                                  - CookieValue
                                  - Domain
                                  - HasResponseHeader
                                  - IsCacheHit
                                  - MimeType
                                  - Status

                                  13 votes
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                                    2 comments  ·  F12 Developer Tools  ·  Flag idea as inappropriate…  ·  Admin →
                                  • Display AppCache results in network inspector

                                    This feature raises the visibility of requests that hit the AppCache by explicitly calling them out as AppCache hits.

                                    Proposed Design
                                    - Cache hits will be tag as "coming from AppCache" in the received column
                                    - The body of responses coming from the cache will be tag as "coming from AppCache" in the response body tab

                                    16 votes
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                                      1 comment  ·  F12 Developer Tools  ·  Flag idea as inappropriate…  ·  Admin →
                                    • Copy network request and response data to clipboard

                                      This feature allows users to copy the contents of a particular request-response to the clipboard.

                                      Proposed Design
                                      - Provide context menu options to allow copying different parts of the request-response to the clipboard
                                      -The following options could be available:
                                      - Copy link address
                                      - Copy request headers
                                      - Copy response headers
                                      - Copy all as HAR
                                      - P2- Copy as Power Shell

                                      14 votes
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                                        0 comments  ·  F12 Developer Tools  ·  Flag idea as inappropriate…  ·  Admin →
                                      • Object mutation breakpoints

                                        This feature would add the ability to set a breakpoint that will break at a JavaScript statement that is mutating an object. The mutation can be either setting the value of the object or changing the value of a property of the object.

                                        Proposed Design
                                        - Context menu "break on mutation"
                                        - Managed through the breakpoint window
                                        - Will not be persisted across navigations (no persisted identity)

                                        14 votes
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                                          0 comments  ·  F12 Developer Tools  ·  Flag idea as inappropriate…  ·  Admin →
                                        • Select, copy & paste multiple CSS rules and properties

                                          This feature would enable the selection of multiple rules and or properties in the styles view of the DOM Explorer. A set of actions (copy. enable, disable, delete, etc.) could then be applied to all of the selected items at once.

                                          Proposed Design
                                          - Enable shift (first and last) and ctrl (individual item) multi selection in the styles views
                                          - In multi select mode only the following commands would be enabled: copy. enable, disable, and delete

                                          12 votes
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                                            1 comment  ·  F12 Developer Tools  ·  Flag idea as inappropriate…  ·  Admin →
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