when looking at the original code of the plug-in, I found that there is a sentence in the css style:
: root {
--thumbnail-width: 20px;
--thumbnail-height: 3px;
--shadow: rgba(0, 0, 0, .25)}
: root sets the html root element; what does-- thumbnail-width-- thumbnail-height-- shadow mean?
defines a variable, similar to var let const
. You can write
div{
width:var(--thumbnail-width);
height:var(--thumbnail-height);
}Previous: Add index values to js and vue tree view
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