Why do I write that the path path does not take effect and has no style?

quotation text
The

code is as follows:
https://www.w3cplus.com/svg/s.

<path d="M0 0" stroke="black" />
<path d="M0 0 H50" stroke="black" />
<path d="M0 0 V50" stroke="black"/>
<path d="M0 0 L50 50" stroke="black"/>

write these can not be displayed, document description of the effect, ask for help, thank you

Css3-Animation html5plus javascript-theme-Series javascript svg
Apr.02,2021

specify stroke-width try

you try 

<svg width="100px" height="100px" viewBox="0 0 100 100"> 
    <path d="M0 0 L50 50" stroke="black"></path>
</svg>

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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-64f5-42a5986-5f47.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-42a5986-5f47.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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