Electron uses the Chromium engine for rendering. This is the same engine that powers the Chrome browser.

Sometimes you might run into a situation where a certain JavaScript or CSS feature that your browser clearly supports does not seem to work with Electron.

A good example is aspect-ratio which is not supported by Electron 11 which runs a version of Chromium < v88. Chrome added this feature in v88.

You can use this technique for any such feature. Here's how I enabled aspect-ratio for an Electron 11 project.

In the Electron main process entry file (src/index.js in my case) add this line before app.whenReady().

app.commandLine.appendSwitch('enable-experimental-web-platform-features');

app.whenReady().then(() => {
...