Our apps present complex text in WKWebView and we are trying to make the apps compliant with dynamic text. I have added `font: -apple-system-font` to the body tag in our css, and on some pages, this triggers dynamic text; on others, it has no effect. According to the WWDC 2017 presentation, as long as you use relative sizes for fonts, this should work.
Are there any other known gotchas in making this work?