I have recently become aware of the ability to animate SVG (Affinity Designer) for the web. There are applications coming out that make it really easy, however, the file size is a serious problem if you intend to have your work in a web page as Affinity does not offer the reduction of file size. Here is a youtube video I made on 09/03/2018. It is impressive what one can achieve. This is a concept for a web homepage. If you look closely there is some really subtle animation. The balloon has a flame which gets turned on and off to make it rise, the balloon also changes size in that as it moves away into the air it gets smaller. The clouds in places are semi-transparent. Also, the sun has a haze around it which disperses as the sun bets higher in the sky. All these really subtle changes make for huge file sizes. One online SVG animator which is still in beta is svgator.com which is free but limited. I have included a file of a puppy wagging its tail and turning its head which I animated in svgator. Just drag the (1A 76 questioning puppy.svg) file onto a web browser and it will automatically play and is on infinite loop. You have to export the files as an SVG from Affinity Designer and then upload that file into the svgator system. The head, body and tail have to be different and separate files to be able to animate them: i.e. the head would be nested in affinity designer the body would be nested and so would the tail. Exported as SVG and then imported to your animator of choice and there are many out there some free.
1A 76 questioning puppy.svg