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only timeThe code in this example is executed sequentially when the page is loaded: the JavaScript code is executed before the browser could see the rest of the page (as the <script></script> is located before the <body>).
The H1 element, for example, does not exist in the Document Object Model, and has not yet been displayed when the JavaScript code is executed. If we move the <script></script> at the end of the document, then the H1 would have been built before the JavaScript code is executed.
The only line of code we have is console.log("Some JavaScript code has been executed");
This means "display in the JavaScript console the message...". If we open the console tab provided by jsbin.com in a dedicated tab (that redirects all console.log() messages), and re-execute the page (just type a space at the end of a line, this will re-render the page and display the message in the console), we see the message in the console tab, as well as in the dev. tools console.
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