Moving CSS content onto a border - html

Question

Right, I ran into a bit of a problem and not to sure if this can be solved another way.
I need to move the content: "F"; and center it onto the border I have in the top left corner. Now is this possible without creating another element?
HTML:
<div class="userBoxF"></div>
CSS:
.userBoxF {
width: 200px;
height: 200px;
background: #eee;
border: 1px solid;
border-radius: 10px;
position: relative;
overflow: hidden;
}
.userBoxF:after {
content: "F";
position: absolute;
top: 0;
left: 0;
width: 0;
height: 0;
border: 40px solid #F385FF;
border-right-color: transparent;
border-bottom-color: transparent;
font-size: 30px;
}
The only way I can think to do it is to create the corner as a completely separate element so I can put the text "F" into a span (or something) and move it that way.
Demo Here
Note: Nothing here will change size, width and height for both the box and corner will always be the same.
Here is what I want, using the solution i found but would rather not use.
HTML:
<div class="userBoxF">
<div class="corner"><span>F</span></div>
</div>
CSS:
.userBoxF {
width: 200px;
height: 200px;
background: #eee;
border: 1px solid;
border-radius: 10px;
position: relative;
overflow: hidden;
}
.userBoxF .corner {
position: absolute;
top: 0;
left: 0;
width: 0;
height: 0;
border: 40px solid #F385FF;
border-right-color: transparent;
border-bottom-color: transparent;
font-size: 30px;
}
.userBoxF .corner span {
display: block;
position: absolute;
top: -30px;
left: -20px;
}
Here is a demo of the solution I came up with but I would rather not create anymore elements.
My Solution

Answer 1

You can use :before wit :after together.
I removed the span:
<div class="userBoxF">
</div>
And changed the CSS blocks to this:
.userBoxF:before {
position: absolute;
top: 0;
left: 0;
width: 0;
height: 0;
border: 40px solid #F385FF;
border-right-color: transparent;
border-bottom-color: transparent;
content: "";
}
.userBoxF:after {
display: block;
position: absolute;
top: 10px;
left: 14px;
content: "F";
font-size: 30px;
}
And here's the updated fiddle
EDIT: Here's an added bonus!
You can jack the "F" from the class, if you want it to be more versatile, if you use CSS's attr inside content. Example:
<div class="userBox" data-l="F">
</div>
And:
.userBox:after {
display: block;
position: absolute;
top: 10px;
left: 14px;
content: "" attr(data-l);
font-size: 30px;
}
And another fiddle

Answer 2

Arguably the "F" is actual content as it's not a styling option...it actually denotes something and, perhaps should be read by a screenreader (for instance) then a span with a gradient (TL - BR) mightbe more appropriate.
JSFiddle Demo
HTML
<div class="userBoxF">
<span class="section-letter">F</span>
</div>
CSS
.userBoxF {
width: 200px;
height: 200px;
background: #eee;
border: 1px solid;
border-radius: 10px;
position: relative;
overflow: hidden;
}
.section-letter {
position: absolute;
top: 0;
left: 0;
width:2em;
height:2em;
line-height: 1em;
text-align: left;
padding:0.25em 0 0 0.25em;
font-size: 30px;
background: linear-gradient(135deg, pink 0%, pink 50%, transparent 50%, transparent 100%);
}

Answer 3

Simply use another :psuedo:
Demo Fiddle
.userBoxF {
width: 200px;
height: 200px;
background: #eee;
border: 1px solid;
border-radius: 10px;
position: relative;
overflow: hidden;
}
.userBoxF:before,.userBoxF:after{
position: absolute;
top: 0;
left: 0;
}
.userBoxF:before {
content:"";
border: 40px solid #F385FF;
border-right-color: transparent;
border-bottom-color: transparent;
}
.userBoxF:after {
content:attr(data-l);
top: 10px;
left: 10px;
font-size: 30px;
}

Answer 4

From a single pseudo, you can use a gradient as background : DEMO
.userBoxF {
width: 200px;
height: 200px;
background: #eee;
border: 1px solid;
border-radius: 10px;
position: relative;
overflow: hidden;
}
.userBoxF:after {
content:"F";
position: absolute;
top: 0;
left: 0;
text-indent:20px;
line-height:60px;
width:80px;
height:80px;
background:linear-gradient(to bottom right, #F385FF 51%, transparent 49%);
font-size: 30px;
}
background-image as gradient can be just an image like in old days :
DEMO: