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: 如果有什么问题，你可以按F5重新加载一个页面，但很多页面数据被保存起来以加快加载速度，这可能就是问题所在。Control+F5可以清除这些数据，并从头开始进行全面的重新加载，从而解决许多问题。