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The Streams API allows developers to have direct access to data streaming from the server - if you want to perform an operation on the data (for example, adding a filter to a video), you no longer need to wait for all of it to be downloaded and converted to a blob (or whatever) - you can start right away. To have the JavaScript "operational", however, it has to be downloaded in its entirety.

It's different with HTML, as the browser is actually streaming the data already and you can see when the elements are loaded and rendered on the website. The app shell model requires all the resources to be available before the website can start rendering. With a little help from service workers, streams can greatly improve the way we parse content.

There are so many varied devices with browsers - it's important to prepare your website so it works on different screen sizes, viewports or pixel densities, using technologies like viewport meta tag, CSS media queries, Flexbox, and CSS Grid.Īn entirely different approach to server- or client-side rendering can be achieved with the Streams API.

Responsive: Responsive web design also applies to progressive web apps, as both are mainly for mobile devices.

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For example, an offline mode with the help of service workers is just an extra trait that makes the website experience better, but it's still perfectly usable without it.

Progressive: Start with the "good, old basic website" and progressively add new features while remembering to detect if they are available in the browser and gracefully handle any errors that crop up if support is not available.

Linkable: Even though it behaves like a native app, it is still a website - you can click on the links within the page and send a URL to someone if you want to share it.

The app shell approach allows websites to be: It's important to remember the PWA advantages and keep them in mind when designing the application. There is also a new approach involving the Streams API, which we'll mention briefly. The most popular approach is the "app shell" concept, which mixes SSR and CSR in exactly the way described above, and in addition follows the "offline first" methodology which we will explain in detail in upcoming articles and use in our example application. PWAs can be built using any approach you like, but some will work better than the others. The first page load is quick because of the SSR, and the navigation between pages is smooth because the client can re-render the page with only the parts that have changed.

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Mixing SSR with CSR can lead to the best results - you can render a website on the server, cache its contents, and then update the rendering on the client-side as and when needed. The website is slower on an initial visit, but can be faster to navigate.

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Client-side rendering (CSR) allows the website to be updated in the browser almost instantly when navigating to different pages, but requires more of an initial download hit and extra rendering on the client at the beginning.It works great across browsers, but it suffers in terms of time navigating between pages and therefore general perceived performance - loading a page requires a new round trip to the server. Server-side rendering (SSR) means a website is rendered on the server, so it offers quicker first load, but navigating between pages requires downloading new HTML content.They both have their advantages and disadvantages, and you can mix the two approaches to some degree.

There are two main, different approaches to rendering a website - on the server or on the client.