AppleScript Dismiss a website dialog box whose text contains something unique

I have this code to dismiss a popup for a website. The popup has no title, however it has text. How can I make this so it doesn't do it for all websites and/or doesn't do it for all dialog boxes. I tried if exists (text "Hit OK to continue" of window "") but it didn't like that. I would like to us it with Safari and Chrome.

repeat
    if (exists application "Google Chrome") then
        tell application "System Events" to tell process "Google Chrome"

            if exists (button "OK" of window "") then
               click (button "OK" of window "")
               delay 2
               click (button "OK" of window "")
            end if

        end tell
    end if

delay 10
end repeat

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