0.4.0 provides built-in support for remembering a user's selections
using local storage. This replaces the custom switch language
JavaScript.
The selection is stored using a key derived from the
options that were available. Concretely, when the options are Java or
Kotlin, the local storage key is java-kotlin. Similarly, if the
choices were Java, Kotlin, and XML, the key would be java-kotlin-xml.
Given local storage's domain and protocol scoping, the nature of the
key that's used for storage will allow a user's selections to be
applied across all documentation hosted on https://docs.spring.io that
offer the same options.
Closes gh-24481
02e90a8645