YSK: You can press F5 to reload a page if something breaks, but a lot of the page data is saved for faster loading, and that might be whats broken. Control+F5 clears this, and does a full proper reload from scratch, fixing many problems.
from /r/YouShouldKnow
YSK: 如果有什麼問題，你可以按F5重新加載一個頁面，但很多頁面數據被保存起來以加快加載速度，這可能就是問題所在。Control+F5可以清除這些數據，並從頭開始進行全面的重新加載，從而解決許多問題。