How this plugin solve compatibility issues between different versions of webview?

hello everyone, I want to try flutter in my new project which is heavily rely on webview. My target devices vary on android verisons，so the webview. AFAK, flutter_webview_plugin also depend on system webview. so my question is,
1 how this plugin handle different version of webview? if I have to write many if xxx also xxx for different versions?
2 is new h5 feature avail on low version of webviews?