Do any browsers support the CSS3 pseudo-element "marker"?

2021 update: all modern browsers have added support for ::marker

• Firefox since v68
• Safari since v11.1 (limited to color and font)
• Chrome (and Edge) since v86
• Opera since v72

https://developer.mozilla.org/en-US/docs/Web/CSS/::marker#browser_compatibility

While no browsers support the spec, Firefox has it's own way of doing things:

li::-moz-list-bullet {
color:blue;
}

Source: https://bugzilla.mozilla.org/show_bug.cgi?id=205202

Could you use :before instead?

li {
 display: block;
 list-style-position: inside;
 margin: 0;
}
li:before { 
 content:" • ";  
 color: green;
}