This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
While this property is still implemented in older browsers,
the latest specification replaces it with the
newVersion attributes. See the compatibility table to know what browsers
readonly attribute unsigned long long? version;
BCD tables only load in the browser