1.CSS-1
<h2 id="css1"></h2>
<style>#css1::before{content:"1.CSS-1";}</style>
2.ATTR-1
<h2 data-title="2.ATTR-1" id="attr1"></h2>
<style>#attr1::before{content:attr(data-title);}</style>
3.IMG-1
<h2><img src="path/to/title1.png" alt=""></h2>
4.B64-1
// PHP GD ⇒ base64 image (see code sample)
5.SVGEM-1
<object data="title1.svg" type="image/svg+xml"></object>
6.CAN-1
<canvas id="can1" width="400" height="60"></canvas>
<script>
const c=document.getElementById('can1').getContext('2d');
c.font='32px Arial';c.fillText('6.CAN-1',10,40);
</script>
7.WEBGL-1
// WebGL canvas – omitted for brevity
8.JS-1
<h2 id="js1"></h2>
<script>document.getElementById('js1').innerText='8.JS-1';</script>
9.EVT-1
<h2 id="evt1">(click)</h2>
<script>document.getElementById('evt1').onclick=()=>{event.target.innerText='9.EVT-1'};</script>
10.COM-1
<h2><!--10.COM-1--></h2>
<script>...extract comment...</script>
11.ENC-1
// atob(<base64>) then inject
12.IFR-1
<iframe src="title1.html"></iframe>
13.PDF-1
<embed src="title1.pdf" type="application/pdf">
14.FNT-1
// custom icon font glyphs
15.FRM-1
<input value="15.FRM-1" disabled>
16.OBJ-1
<object data="title1-content.html"></object>
17.EMB-1
<embed src="title1-content.html">
18.SHD-1
<h2 is="shadow-title-1"></h2>
<script>
class ShadowTitle1 extends HTMLHeadingElement{
constructor(){super();const s=this.attachShadow({mode:'closed'});
const span=document.createElement('span');span.textContent='18.SHD-1';s.appendChild(span);}
}
customElements.define('shadow-title-1',ShadowTitle1,{extends:'h2'});
</script>
19.B64SVG-1
// <img src="data:image/svg+xml;base64,...">
20.XHR-1
<h2 id="xhr1"></h2>
<script>fetch('title1.txt').then(r=>r.text()).then(t=>xhr1.innerText=t);</script>
