How to display?
Progressbar?
Render seconds https://github.com/VovanR/test-fotostrana https://vovanr.github.io/test-fotostrana

Or test sound on timer start
Or test sound on service opened

https://vovanr.com/services/

https://github.com/wuct/raf-throttle
https://github.com/VovanR/test-fotostrana/blob/master/src/js/vendor/rAF.js

Start new timer immediately if application opened with location search params
`https://vovanr.github.io/dozed-off?time=25

https://rollupjs.org/guide/en/#a-simple-example

• https://github.com/facebookincubator/create-react-app
• http://redux.js.org/
• https://github.com/reactjs/react-redux
• https://github.com/erikras/ducks-modular-redux
• https://flow.org/
• http://airbnb.io/enzyme/
• https://facebook.github.io/jest/
• https://github.com/reactjs/reselect
• https://github.com/acdlite/recompose
• ? http://ramdajs.com/docs/
• ? https://facebook.github.io/immutable-js/
• https://github.com/styled-components/styled-components
• .editorconfig
• .eslintrc
• .gitattributes
• .mversionrc
• http://commitizen.github.io/cz-cli/ for https://github.com/conventional-changelog/conventional-changelog
• https://github.com/stylelint/stylelint
• https://github.com/typicode/husky

https://travis-ci.org/profile/VovanR
Deploy to gh-pages https://github.com/settings/tokens
.travis.yml

https://github.com/DevExpress/testcafe

Because of window.requestAnimationFrame()

• timer 1: beep!
  • timer 1-1: beep! beep!
• timer 2: bop!
  • timer 2-1: bop! bop!

https://github.com/VovanR/dozed-off

• https://github.com/mdn/webaudio-examples
• https://github.com/stewdio/beep.js
• https://stackoverflow.com/questions/879152/how-do-i-make-javascript-beep
• https://developer.mozilla.org/en-US/docs/Web/API/MIDIAccess
• https://unpkg.com/#/
• https://css-tricks.com/form-validation-web-audio/
• https://codepen.io/gregh/post/recreating-legendary-8-bit-games-music-with-web-audio-api
• https://tonejs.github.io/

https://vovanr.com/choice-roulete/
https://github.com/VovanR/choice-roulete/blob/master/css/settings.css

Check timer status
Resume timer if status is playing and calculated progress is not ended

• README.md
• index.html
• package.json

https://developer.mozilla.org/en/docs/Web/API/notification

• root timer: beep!
  • child timer: beep! beep!
    • timer: beep! beep! beep!