There are many websites have their own built in shortcuts, and some of them just so annoying.
Such as a Trello card, by hitting [spacebar] makes you Assign yourself from a card, But I just want it to be normal to scroll down the page. So I built the macro below.
Keyboard Maestro 8.2 “Space alternative for Trello” Macro
Have you tried reversing the If Then Else actions? That is, if the URL Does Not Contain Trello.com, execute a Space, otherwise simulate the scroll wheel (which, alternatively, might perform better if set to simulate Page Down).
Thanks for reply~ I tried it but ti seems that also has the problem – slow down the speed when I type a literal space on browser. What is worse, I just can’t type a real ‘space’ in trello page.
I don't have a Trello account, but testing this on the site's homepage seemed to work without any delay there or on other sites. The difference in this setup is that rather than creating a variable based on the URL, this macro just checks for "Trello" in the window name.