"This Text is inside a solid Border ⤴"
The border here is done using an SVG border image. And the whole image is inlined in the CSS. No file request is needed. I think this is f... awesome. If you want to encode your SVG, I suggest you use this Tool by @yoksel_en.
The same goes for the little arrow thingie located at the right border. It is a pseudo-element with an inline background SVG.
THIS IS AN INSET BORDER
"this dotted border looks like teeth"
"Here u can see Tyler The Creator falling through the website cause I hid the bottom border of his frame which was made with 4 different borders👇 #srytyler"
"THIS SLICK LOOKIN BORDER IS MADE OUT OF 2 GROOVE & 2 RIDGE BORDERS"
"HERE U CAN SEE DONALD TRUMP BEING SURROUNDED BY AN IMAGE BORDER OF THE MEXICAN BORDER "
"Here I am not only showing you how to cross the Mexican border you also learn that this 2 colored border was made with a small trick."
I used an outline to imitate a second border"