Just to add to that, you can also just print " "; .

Sure, you can do that. The benefit of HTML comments as heartbeats is that they can also serve as diagnostic information. E.g., you can print timestamps in them, so get some feel for where your long-running program is spending time, and whether the heartbeats are too far apart (which risks a browser timeout).

In reply to Re: Re: Re: Preventing Browser Timeout by dws
in thread Preventing Browser Timeout by Anonymous Monk

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