If I do a SEARCH: at
https://download.java.net/java/early_access/jdk11/docs/api/overview-summary.html
and select the element for ArrayList#add(E), it tries to go to
https://download.java.net/java/early_access/jdk11/docs/api/java.base/java/util/ArrayList.html#add-E-
but that's not a correct fragment for this API element. Instead, this URL works:
https://download.java.net/java/early_access/jdk11/docs/api/java.base/java/util/ArrayList.html#add(E)