To determine whether these selectors are actually reducing performance, use the Selector Stats feature in the Performance tool. This is a list of selectors that could possibly reduce performance. This list of non-simple CSS selectors in the CSS Overview tool provides a quick way to identify common culprits that might be causing long-running Recalculate Styles events: The CSS Overview tool has a new Non-simple selectors section, which displays a list of non-simple CSS selectors when you take an overview snapshot of your webpage's CSS. Record performance in Performance features reference.ĬSS Overview tool displays non-simple selectors for quick performance gains.Securely debug original code by using Azure Artifacts symbol server source maps.Securely debug original code by publishing source maps to the Azure Artifacts symbol server.Performance tool unminifies file and function names when profiling production code in What's new in DevTools (Microsoft Edge 111).As a result, after recording a profile in the Performance tool, you can now see unminified file and function names for the JavaScript execution that occurs within an OOPIF: In Microsoft Edge 112, the Performance tool now loads sourcemaps and applies them to the performance events that are tracked in OOPIFs. When recording a profile in the Performance tool, the tool can only display the minified file and function names in the flame chart, not the unminified names: As a result, the Performance tool was not able to apply sourcemaps to performance events that are from an OOPIF. In previous versions of Microsoft Edge, JavaScript execution in an out-of-process iframe (OOPIF) was isolated from DevTools. Performance tool unminifies JavaScript running in out-of-process iframes To report a problem with DevTools or ask for a new feature, file an issue in the MicrosoftEdge/DevTools repo. See Microsoft Edge Insider Channels.įor the latest announcements, follow the Microsoft Edge team on Twitter. The Beta, Dev, and Canary versions of Microsoft Edge run as separate apps, side-by-side with the stable, released version of Microsoft Edge. Whether you're on Windows, Linux, or macOS, consider using Canary (or another preview channel) as your default development browser. To stay up to date and get the latest DevTools features, download an Insiders preview version of Microsoft Edge. To check out the latest features of Microsoft Edge DevTools and the Microsoft Edge DevTools extension for Microsoft Visual Studio Code and Visual Studio, read these announcements.
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