Posts Tagged ‘RemoteDebugging’
[DevoxxBE2012] The Chrome Dev Tools Can Do THAT
Ilya Grigorik, a Google web performance engineer and developer advocate, unveiled advanced capabilities of Chrome Developer Tools. Ilya, focused on accelerating the web, overwhelmed attendees with tips, dividing into inspection/debugging and performance analysis.
He encouraged hands-on exploration via online slides, emphasizing tools’ instrumentation for pinpointing bottlenecks.
Starting with basics, Ilya showed inspecting elements, modifying DOM/CSS live, and using console for JavaScript evaluation.
Advanced features included remote debugging for mobile, connecting devices to desktops for inspection.
Inspection and Debugging Essentials
Ilya demonstrated breakpoints on DOM changes, XHR requests, and events, pausing execution for analysis.
Color pickers, shadow DOM inspection, and computed styles aid UI debugging.
Console utilities like $0 for selected elements, querySelector, and table formatting enhance interactivity.
JavaScript Profiling and Optimization
CPU profilers capture call stacks, revealing hot spots. Ilya profiled loops, identifying inefficiencies.
Heap snapshots detect memory leaks by comparing allocations.
Source maps map minified code to originals, with pretty-printing for readability.
Network and Resource Analysis
Network panel details requests, with filters and timelines. Ilya explained columns like status, size, showing compression benefits.
WebSocket and SPDY inspectors provide low-level insights.
HAR exports enable sharing traces.
Timeline and Rendering Insights
Timeline records events, offering frame-by-frame analysis of layouts, paints.
Ilya used it to optimize animations, enabling GPU acceleration.
CSS selectors profile identifies slow rules.
Auditing and Best Practices
Audits suggest optimizations like minification, unused CSS removal.
Extensions customize tools further.
Low-Level Tracing and Customization
Chrome Tracing visualizes browser internals, instrumentable with console.time for custom metrics.
Ilya’s session equipped developers with powerful diagnostics for performant, debuggable applications.