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What you’ll learn#

  • This glossary contains an explanation of the technologies and terms used in the Canarytrace ecosystem.

Web Performance Testing#

Web Performance Testing is type of automation test for measuring of key performance indicators of web application. Metrics such as WebVitals, JS Heap, throughput, count tasks over 100ms, Time to First Byte, Response Time etc. it is measured and analysed directly in a browser. In this case is a browser and his APIs and diagnostic tools guarantee for data accuracy.


Is the time, when first byte from response arrived to browser net stack.

Response Times#

Is the time, when the entire response, including body, arrived at the browser

Performance Entries#

Performance entries is a collection of a single performance metric that is part of the performance timeline.

Load Event End#

Is the time, when is current loading complete. Canarytrace awaits this event. After this event it's possible to perform next operations in the monitor script e.g. titleElm.waitForExist(…)

entryType: navigation#

entryType: resource#

Test Case / Monitor script#

It’s the same code / file. In the world of functional testing is used terms Test Case, but for management and other colleagues is better to use term monitor script.

  • Example with test case saved to smoke.js @todo

Hero Elements#

It’s a method for accurate measurement when and what is displayed for the user.

  • Hero Elements @todo


The time, given in milliseconds, should be accurate to 5 µs (microseconds), with the fractional part of the number indicating fractions of a millisecond. However, if the browser is unable to provide a time value accurate to 5 µs (due, for example, to hardware or software constraints), the browser can represent the value as a time in milliseconds accurate to a millisecond. Documentation

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