JSFiddle - React, Tailwind, and code Playground

HTML

Is it green?
<ul>
    <li id="1">1 as #1</li>
    <li id="2">2 as #\32</li>
    <li id="12">12 as #12</li>
    <li id="13">13 as #\313</li>
    <li id="14">14 as #\31\34</li>
    <li id="15">15 as #\31 5</li>
    <li id="a1">a1 as #a1</li>
    <li id="1a">1a as #1a</li>
    <li id="2a">2a as #\32a</li>
    <li id="3a">3a as #\33\3a</li>
    <li id="4a">4a as #\34 a</li>
</ul>

CSS

#1 {color:green;}
#\32 {color:green;}
#12 {color:green;}
#\313 {color:green;}
#\31\34 {color:green;}
#\31 5 {color:green;}
#a1 {color:green;}
#1a {color:green;}
#\32a {color:green;}
#\33\3a {color:green;}
#\34 a {color:green;}