When render is finished (means after TW transition effect) you see line is disappeared!
Hi Mat,Using firefox I have not had that problem. I wonder are you not able to export as .json either?
1. Chrome block downloading json, but you can tell Chrome they are safe and keep them
2. TW has a transition effect when you open a tiddler so by transition effect I mean what TW does on tiddler opening
3. render finished may be wrong here! but I mean when you click tiddler during transition TW shows the contents at that time blue bullets and a horizontal line can be seen butwhen transition effect finished and tiddler settled in its position in story river you cannot see the horizontal line!

What I get in TW 5.1.20

See my next post! publishing a small horizontal timeline!
.xx li {
width: 2em;
height: 2em;
line-height: 2em;
/*font-size: 12px;
font-family: arial, calibri, sans-serif;
font-weight: bold;*/
text-align: center;
border-radius: 50%;
background: dodgerblue;
display: inline-block;
color: white;
position: relative;
margin: 0px 10px;
/* box-shadow: 0 0 3px 3px grey;*/
}
.xx li::before {
content: '';
position: absolute;
top: 50%;
left: -100%;
width: 100%;
height: 2px;
background: dodgerblue !important;
z-index: -1;
}
.xx li:first-child::before {
display: none;
}
.xx li:after {}
.xx .active {
background: dodgerblue;
}
.xx li.active+li::before {
z-index: -1 ;
}
.xx .active~li {
background: lightblue;
}
.xx .active~li::before {
background: lightblue;
z-index: auto ;
}