Basically use <style> elements to replace document.adoptedStyleSheets if it is not available.
<style>
document.adoptedStyleSheets
Note that this means that we are not able to use the advantage of the separation between eager and lazy styles.
In Safari I am also unable to clone the <style> element and keep its sheet property at the same time, so the style is modified in place.
sheet
Closes #1319 (closed)
