Untitled

<html>
    <body>
    <p class="ram-description">Your device memory is <span id="result">unknown</span> GB.</p>

<script>
document.getElementById('result').innerHTML = navigator.deviceMemory || 'unknown'
</script>
</body>
</html>

<html>
<body>
<p class="ram-description"><b id="result">Your device memory is <b id="result">unknown</b> GiB.</p>

<script>
document.getElementById('result').innerHTML = navigator.deviceMemory || 'unknown'
</script>
</body>
</html>