According to the website I visit, the source is never the same size. I have it set at 120%.
Example on Twitter with the maximum size in Twitter settings the same way the letters look small. But if he says a tweet in the timeline, when he enters the twett it looks like the biggest letters as it should be.
On the web pages directly the whole page goes with the small ones. They look very .
They never wear the same size all that in this case should be 120% for me.