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What does && in javascript mean when used on html elements?

When updating Google Tag Manager to support CSP and nonce, they say to use this script: (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start': new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0], j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src= 'https://www.googletagmanager.com/gtm.js?id='+i+dl;var n=d.querySelector('[nonce]'); n&&j.setAttribute('nonce',n.nonce||n.getAttribute('nonce'));f.parentNode.insertBefore(j,f); })(window,document,'script','dataLayer','GTM-XXXXXX'); The n&&j.setAttribute() is confusing to me; not sure if it's just a lack of Javascript…

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Html – CSS: How to toggle the borders of a specific table column without twitching

function toggleBorders() { table.tHead.firstElementChild.children[1].classList.toggle('thick-border'); Array.from(table.tBodies[0].children).forEach(row => row.children[1].classList.toggle('thick-border')); } table { border-collapse: collapse; } th.thick-border, td.thick-border { border: 3px solid coral; border-top: none; border-bottom: none; } <table id="table"> <thead> <tr> <th>h1</th> <th>h2</th> <th>h3</th> <th>h4</th> </tr> </thead> <tbody> <tr> <td>11</td> <td>12</td> <td>13</td>…

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