meta property="og:url" content="https://book.javascript-for-r.com/">
<meta name="twitter:card" content="summary_large_image">
<meta property="og:site_name" content="Chapter 6 A Realistic Widget | JavaScript for R">
<meta name="twitter:image:alt" content="Book on using JavaScript with R for visualisations, web development, and computations.">
<meta name="twitter:site" content="@jdatap">


<style type="text/css">
a.sourceLine { display: inline-block; line-height: 1.25; }
a.sourceLine { pointer-events: none; c