Simon Willison’s Weblog

If you use a JavaScript framework you should:

• be able to justify with evidence, how using JavaScript would benefit users
• be aware of any negative impacts and be able to mitigate them
• consider whether the benefits of using it outweigh the potential problems
• only use the framework for parts of the user interface that cannot be built using HTML and CSS alone
• design each part of the user interface as a separate component

Having separate components means that if the JavaScript fails to load, it will only be that single component that fails. The rest of the page will load as normal.

— GOV.UK service manual