@saltnburnem

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Thanks CodeMash!

@saltnburnem

#CodeMash

@saltnburnem

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#DeveloperCommunity

@saltnburnem

#DeveloperCommunity | #CodeMash

Chris DeMars

@saltnburnem

@chrisdemars.net

🦋

Senior Developer Advocate II

#DeveloperCommunity | #CodeMash

International Speaker
Love spooky stuff
Tattoo collector
Competitive Bass Angler
Competitive Paintball Player

About Me

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@saltnburnem

The Power of Feature Flags in CSS Development

@saltnburnem

#DeveloperCommunity | #CodeMash

It's not that scary

trust me...

@saltnburnem

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What is A/B testing?

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What is A/B testing?

A/B testing, otherwise known as split testing, is the process of testing two different versions of a web page or product feature against the original, existing version.

- Talia Nassi

@saltnburnem

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Username

Password

provider

Create Account

A

@saltnburnem

#DeveloperCommunity | #CodeMash

Username

Password

provider

Create Account

Username

Password

provider

Create

A

B

@saltnburnem

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Why?

@saltnburnem

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⬇️ Answers ⬇️

Awesome user experience
Increase revenue
Data correlation for better business decisions
Fine grained control of code exposure

@saltnburnem

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How?

@saltnburnem

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Well set up an experiment of course!

@saltnburnem

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That is what we call a moron.

That is not an experiment.

@saltnburnem

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First

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First

Gather that data!

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❗️ Baseline before experiment! ❗️

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Scientific Method

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Scientific Method

Ask a question
Do research
Construct a hypothesis
Experiment
Draw conclusion

@saltnburnem

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Scientific Method

Construct a hypothesis
Experiment

@saltnburnem

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If we ship this new button, our retention will increase by 20%.

Hypothesis

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Experiment time!

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Username

Password

provider

Create Account

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provider

Create

A

B

Control

Treatment

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Feature Flags

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Segment Users

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Username

Password

provider

Create Account

Username

Password

provider

Create

A

B

Control

Treatment

50%

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Flex that UI muscle!

@saltnburnem

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You can be a CSS dev and use feature flags!

@saltnburnem

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CSS...like CSS

IYKYK

@saltnburnem

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// get treatment
  let treatment = client.getTreatment('css_demo');

  // get features to flip based upon CSS classes
  const featureA = document.querySelectorAll('.a');
  const featureB = document.querySelectorAll('.b');

  if (treatment === 'on') {

      featureB.forEach(element => {
          element.classList.add('hide')
      })
  } else if (treatment === 'off') {
      featureA.forEach(element => {
          element.classList.add('hide')
      })
  } else {
      console.error('Error connecting to Split')
      // default rule here
      featureA.forEach(element => {
          element.classList.add('hide')
      })
  }

});

@saltnburnem

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Demo

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It's a happy cry!

Go Forth and Test in Production!

Chris DeMars

@saltnburnem

Resources

https://bit.ly/css-feature-flags

Thanks CodeMash!

#CodeMash

#DeveloperCommunity

Chris DeMars

@saltnburnem

@chrisdemars.net

🦋

Senior Developer Advocate II

About Me

The Power of Feature Flags in CSS Development

It's not that scary

trust me...

What is A/B testing?

What is A/B testing?

A

A

B

Why?

⬇️ Answers ⬇️

How?

Well set up an experiment of course!

That is what we call a moron.

That is not an experiment.

First

First

Gather that data!

Scientific Method

Scientific Method

Scientific Method

If we ship this new button, our retention will increase by 20%.

Hypothesis

Experiment time!

A

B

Control

Treatment

Feature Flags

Segment Users

A

B

Control

Treatment

50%

50%

Flex that UI muscle!

You can be a CSS dev and use feature flags!

CSS...like CSS

IYKYK

Demo

It's a happy cry!

Go Forth and Test in Production!

Chris DeMars

@saltnburnem

@chrisdemars.net

🦋

The Power of Feature Flags in CSS Development

More from Chris DeMars