具有document.domain的sessionStorage

Question

According to the spec, I should be able to set the document.domain to my root domain and thus have subdomains share sessionStorage. But I can't seem to get that to work. Is that no longer allowed? https://html.spec.whatwg.org/multipage/browsers.html#relaxing-the-same-origin-restriction

// set the document domain to the top level
let hostParts = location.hostname.split('.').reverse();
if (hostParts.length > 1)
    document.domain = `${hostParts[1]}.${hostParts[0]}`;

this.sessionId = window.sessionStorage.getItem('hplrSn');
if (!this.sessionId) this.sessionId = generateId();

The above code will generate a new Id for both site1.dn.domain.com and site2.dn.domain.com

Answer 1

Check this question: In HTML5, is the localStorage object isolated per page/domain?

It work for page www.a.com/page1 and www.a.com/page2 , but not for your use case: sessionstorage for www.aacom and www.bacom is not shared.

You should try Cookie