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HEADLESS BROWSER EXPERIMENTS A short journey about taking screenshots with headless browsers Christian Bäuerlein / @fabrik42

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A headless browser is a web browser without a graphical user interface.

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PhantomJS SlimerJS CasperJS many more!

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USE CASES Running test suites Web scraping / Automation Taking screenshots

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TAKING SCREENSHOTS

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The project: A desktop website that lets users create a custom mobile web app.

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The challenges: How to render a list of created apps? How to share your creations with others?

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HTML IS NOT SHAREABLE URLs are easy to share. Textual content is easy to share. Visual representations in HTML are not easy to share. But images are :)

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SCREENSHOTS!

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PHANTOMJS 1.X Good Just one binary Not So Good Project was somehow stalled Bad No web font support :(

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PHANTOMJS 2.0! Including web font support! *yay* Let's try again...

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PROBLEM Present your work on a web page to somebody who can't access it right now.

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RESPONSIVE MOCKUPS github.com/fabrik42/responsive_mockups

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RESPONSIVE MOCKUPS Takes screenshots of a webpage in different resolutions and automatically applies it to mockup templates.

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REQUIREMENTS Easy to install. No dependencies, if possible. Nice templates to start right away.

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EASY INSTALLATION brew install phantomjs git clone [responsive_mockups] && cd responsive_mockups phantomjs example.js

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EXAMPLE.JS var mockup = require('./index'); mockup.create({ url: 'https://flinc.org/home', template: 'flat_responsive_2', output: 'my_mockup.png' });

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HOW IT WORKS 1. User provides URL and template name. 2. PhantomJS generates screenshots based on different viewports. 3. PhantomJS assembles mockup image using a local HTML file and .

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RESPONSIVE MOCKUPS github.com/fabrik42/responsive_mockups

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Mockup graphics are nice, but what about... MOCKUP PHOTOS?

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DEMO TIME!

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http://phantomjs.org/supported-web-standards.html WebGL CSS 3D Video and Audio The following features, due to the nature of PhantomJS, are irrelevant:

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Atom Editor Visual Studio Code Slack Mapbox Map Designer ... nightmare.js!

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Knows how to WebGL :)

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ONE MORE THING...

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Now that we mastered all kind of images, what about...

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MOVIES!

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STOP MOTION IN HTML & JS Create an animation Stop at every frame Make a screenshot Go to the next frame

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DEMO TIME!

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Remember: We wanted to make things shareable.

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CUSTOMIZED MOVIES!

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Manipulate the movie while rendering the frames browser .evaluate(function (currentFrame) { stage.goto(currentFrame); }, currentFrame)

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ADVANCED DEMO TIME!

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Q & A Christian Bäuerlein github.com/fabrik42 twitter.com/fabrik42 [email protected]