Thanks all, your responses have been incredibly helpful. In summary (besides the layout-specific stuff which was great) - between the MDN documentation for le

Thanks all, your responses have been incredibly helpful. In summary (besides the layout-specific stuff which was great) - between the MDN documentation for learning and reference: https://developer.mozilla.org/en-US/docs/Web https://developer.mozilla.org/en-US/docs/Web And, for checking compatiblity and common practice: https://caniuse.com https://caniuse.com A n00b like me can get a decent handle on current best practice and standards for web dev. Feel levelled-up - much appreciated!