My example for WebGL and the monitor test use a canvas element for display. In addition there is an option to switch to fullscreen mode. Technically this is achieved by using the fullscreen API. The implementation is always the same:
When clicking the button fullscreen mode the canvas element will be changed to fullscreen by using requestFullscreen().
A handler which reacts to fullscreen changes corrects the width and height of the element to the screen size taking window.devicePixelRatio into account to support the native resolution of the device.
Recently a good friend of mine gave me a used Intel Xeon E5-1650 v2 which he didn’t need any longer as a gift. According to the data of Intel this model was already introduced in the third quarter of 2013 and is therefore 7 years old as of August 2020.
Calling this “retro” may be a bit exaggerated – but it is a valid question if using such an old processor still makes sens in the year 2020. Current models provide more performance while also often using less power. In addition memory modules with DDR4 provide a higher throughput as well.
On the other hand my old PC is still mostly based on the hardware with Xeon E3 which I bought already in 2014 and which got equipped with SSDs as mass storage and a new graphics card running a 4K display. Despite its age it is still usable quite well. Moving to the Xeon E5 would be an easy upgrade since I only would have to change the mainboard and the CPU cooler. The existing RAM modules could be used unchanged.