You can change a URL like
Is it possible to completely change the URL like from
Welcom.To.The.Website using the URL bar as a display?
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Is it possible to completely change the url like from google.com to Welcom.To.The.Website
No, you cannot change the domain (ie. the origin). Presumably you are referring to HTML5's
pushState()? From Mozilla Developer help:
The new URL must be of the same origin as the current URL; otherwise, pushState() will throw an exception.
Apart from being confusing for users. This would also be a security issue. Pretending to be a site you are not - phishing. A website could also trick you into visiting another malicious website just by hitting the back button.