# \#webinar
**URL:** https://forum.openzeppelin.com/tag/webinar/44.md
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## [How can I use defender-relay-client in web-browser?](https://forum.openzeppelin.com/t/how-can-i-use-defender-relay-client-in-web-browser/5288)
**Author:** [@loophe](https://forum.openzeppelin.com/u/loophe)\
**Replies:** 3\
**Last updated:** [February 17, 2021, 1:48pm UTC](https://forum.openzeppelin.com/t/how-can-i-use-defender-relay-client-in-web-browser/5288 "2021-02-17T13:48:58Z")
:computer: Environment I’m using Defender-relay-client locally :memo:Details but i didn’t find instructions about web-browser option. when i included Defender-relay-client in dependence in web-browser app, or just b…
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## [Webinar Series: Introduction to Backrunning](https://forum.openzeppelin.com/t/webinar-series-introduction-to-backrunning/3627)
**Author:** [@abcoathup](https://forum.openzeppelin.com/u/abcoathup)\
**Replies:** 5\
**Last updated:** [December 16, 2020, 9:40pm UTC](https://forum.openzeppelin.com/t/webinar-series-introduction-to-backrunning/3627 "2020-12-16T21:40:35Z")
Watch introduction to Ethereum backrunning :movie\_camera: First webinar from OpenZeppelin and IDEO CoLab :speaking\_head: Austin Williams and Dan Elitzer explore :running\_man:
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## [RSK Workshop: Smart contract testing with OZ CLI](https://forum.openzeppelin.com/t/rsk-workshop-smart-contract-testing-with-oz-cli/3651)
**Author:** [@bguiz](https://forum.openzeppelin.com/u/bguiz)\
**Replies:** 2\
**Last updated:** [August 31, 2020, 3:12am UTC](https://forum.openzeppelin.com/t/rsk-workshop-smart-contract-testing-with-oz-cli/3651 "2020-08-31T03:12:34Z")
:wave: all! Here's a webinar I ran on testing, with two hands-on workshops: One for general testing (in Javascript), and another for testing smart contracts using OZ CLI. Note: This is done on RSK, but it…