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I just discovered a bug when I started to self hosting a two fonts, winch is Open Sans and Source Sans Pro. Open Sans will display on the small text class and middle text class, and Source Sans Pro will display for body, Means that I replaced some body and smalltext fonts winch is formerly IBM Plex Sans fonts. When I add a OpenType feature at here below...

.smalltext, .middletext {
font-family: 'Open Sans', 'Segoe UI', 'Roboto', 'Arial', sans-serif;
font-feature-settings: "ss03";
}
...then Open Sans fonts should changes the letter "I" and "J", but when I looked at homepage, I notice that Open Sans Regular has non-functioning OpenType Features even I used the latest version of Open Sans, I looked a Open Sans Bold and OpenType features are just worked fine. I am confused with this bug, could anyone help this?


The demonstration of Open Sans Regular and Bold :


Open Sans Regular:



Open Sans Bold:

Hello, I am have question, If I uploaded a .css or .js file to file manager, Will these files automatically linked or I have to link it manually?

If the .css or .js is confirmed that will be linked/actived automatically, Then you don't need a help to me.

If I have to link it manually, then what should I do to link them?

Sorry, there's the typo with "tff" should be "ttf" (2 "t" letters and 1 "f" letter), btw, I also need "ttc" and "svg" files allowed

I Still not seeing a allowed files are ttf, otf, woff, woff2, eot font file formats on my forum, how?

Alright, now it's 100% changed. I just have found a solution by adding the below

.smalltext {
font-family: 'IBM Plex Sans', 'sans-serif';
}


Are you familiar wtih developer tools in the browser? You can inspect elements on the page and see what class/area in the css to change that would affect the font in that area.

The font itself comes back to Verdana again when refreshing the page, How I can make the IBM Plex Sans fonts are maintain these between page refresh?