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# uninstall previous Gulp installation, if any
$ npm uninstall gulp -g
$ cd [your_project_root]
$ npm uninstall gulp

# install Gulp 4 CLI tools globally from 4.0 GitHub branch
$ npm install gulpjs/gulp-cli#4.0 -g

# install Gulp 4 into your project
$ npm install gulpjs/gulp.git#4.0 --save-dev

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npm cache clean

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# uninstall previous Gulp installation if any.

npm uninstall gulp -g
cd [your_project_root]
npm uninstall gulp

# install Gulp 4 CLI tools globally from 4.0 GitHub branch

npm install gulpjs/gulp-cli#4.0 -g

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The definition of animation and the web context

Animation, by definition, is the process of creating a continuous motion over a period of time.

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##CSS Transition animation

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##CSS3 transitions

CSS Transitions allows property changes in CSS values to occur smoothly over a specified duration.

CSS is a language for describing the rendering of structured documents (such as HTML and XML) on screen, on paper, in speech, etc. - http://dev.w3.org/csswg/css-transitions/

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##CSS Keyframe animation

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##Transition-timing-function

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##CSS3 transform rotate

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