This template is called an app shell and is the basis for a Progressive Web App PWA. We’ll explore this next.
You can quickly check if a website is built on a JavaScript framework using a technology lookup tool like BuiltWith or Wappalyzer . You can also “Inspect Element” or “View Source” in your browser to inspect the JS code. Popular JavaScript frameworks you might find include:
Google's Angular
Facebook’s React
Vue by Evan You
JavaScript SEO for Core Content
Here's an example: Modern web applications are being built on JavaScript frameworks like Angular, React, and Vue. JavaScript frameworks allow developers to quickly build and scale interactive web applications. Let's look at the default project template for Angular.js, a popular framework made by Google.
When viewed in a browser, this looks like a typical web tunisia mobile database page. We can see text, images, and links. However, let's explore the code a little deeper:
Now we can see that this HTML document is almost completely empty. There is only the application root and some script tags in the body of the page. This is because the main content of this single-page application is dynamically injected into the DOM via JavaScript. In other words, this application relies on JS to load key content on the page!
Potential SEO issues: Any core content that is presented to users but not presented to search engine robots could have serious issues! If search engines can’t fully crawl all of your content, your site could be ignored in favor of your competitors. We’ll discuss this in more detail later.