Memory debugging (please help)

hi , why in dont recieve any errors like these examples =



i clicked allocate too much memory like 10 times but no error (i checked the console tab and it was generating alot of string very fast , but then my browser didnt crashed , nor i recieved any errors , i just waited like 15 minutes until it finishes)
even on the second picture i clicked that move elements alot , but again no error , but it seems like that i had to recieve Forced reflow is a likely performance bottleneck, Long task took x ms, and Handler took x ms. , but then i didnt.
am i doing something wrong ?
how to get these errors ?