Implementation of Tree Graphics with ul

for example, how to use ul to realize the graph of tree structure?
like the tree rendered by pstree under linux, it has a straight line connection.

Tree-structure html+css+js
Mar.25,2021

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e3fc0b-44874.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e3fc0b-44874.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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