And in any case, even without those controls there is still F5. Page refresh. Or, for that matter, hit the BACKSPACE key when the focus is on the page, not on any sub-element thereof.
Or or or...
Truly, this needs at least *SOME* server-side support.
An optimist sees the glass as half full.
A pessimist sees the glass as half empty.
A realist drinks it no matter how much there is.