diff --git a/tests/hs-run-filtered.js b/tests/hs-run-filtered.js
index 12485c67..652192e9 100755
--- a/tests/hs-run-filtered.js
+++ b/tests/hs-run-filtered.js
@@ -33,8 +33,8 @@ function mkStyle(tag) {
   return s;
 }
 class El {
-  constructor(t) { this.tagName=t.toUpperCase(); this.nodeName=this.tagName; this.nodeType=1; this.id=''; this.className=''; this.classList=new CL(this); this.style=mkStyle(this.tagName); this.attributes={}; this.children=[]; this.childNodes=[]; this.childNodes.item=function(i){return this[i]||null;}; this.parentElement=null; this.parentNode=null; this.textContent=''; this.innerHTML=''; this._listeners={}; this.dataset={}; this.open=false; this.value=''; this.defaultValue=''; this.checked=false; this.defaultChecked=false; this.disabled=false; this.type=''; this.name=''; this.selectedIndex=-1; this.defaultSelected=false; this.selected=false; this.options=[]; }
-  setAttribute(n,v) { this.attributes[n]=String(v); if(n==='id')this.id=v; if(n==='class'){this.className=v;this.classList._sync(v);} if(n==='value'){this.value=v;this.defaultValue=v;} if(n==='name')this.name=v; if(n==='type')this.type=v; if(n==='checked'){this.checked=true;this.defaultChecked=true;} if(n==='selected'){this.selected=true;this.defaultSelected=true;} if(n==='multiple')this.multiple=true; if(n==='disabled')this.disabled=true; if(n==='style'){const s=String(v);for(const d of s.split(';')){const c=d.indexOf(':');if(c>0){const k=d.slice(0,c).trim();const val=d.slice(c+1).trim();if(k)this.style.setProperty(k,val);}} } }
+  constructor(t) { this.tagName=t.toUpperCase(); this.nodeName=this.tagName; this.nodeType=1; this.id=''; this.className=''; this.classList=new CL(this); this.style=mkStyle(this.tagName); this.attributes={}; this.children=[]; this.childNodes=[]; this.childNodes.item=function(i){return this[i]||null;}; this.parentElement=null; this.parentNode=null; this.textContent=''; this.innerHTML=''; this._listeners={}; const _el=this; const _datasetBacking={}; this.dataset=new Proxy(_datasetBacking,{set(o,k,v){o[k]=v;if(typeof k==='string'){const attr='data-'+k.replace(/[A-Z]/g,c=>'-'+c.toLowerCase());_el.attributes[attr]=String(v);}return true;},deleteProperty(o,k){delete o[k];if(typeof k==='string'){const attr='data-'+k.replace(/[A-Z]/g,c=>'-'+c.toLowerCase());delete _el.attributes[attr];}return true;}}); this.open=false; this.value=''; this.defaultValue=''; this.checked=false; this.defaultChecked=false; this.disabled=false; this.type=''; this.name=''; this.selectedIndex=-1; this.defaultSelected=false; this.selected=false; this.options=[]; }
+  setAttribute(n,v) { this.attributes[n]=String(v); if(n==='id')this.id=v; if(n==='class'){this.className=v;this.classList._sync(v);} if(n==='value'){this.value=v;this.defaultValue=v;} if(n==='name')this.name=v; if(n==='type')this.type=v; if(n==='checked'){this.checked=true;this.defaultChecked=true;} if(n==='selected'){this.selected=true;this.defaultSelected=true;} if(n==='multiple')this.multiple=true; if(n==='disabled')this.disabled=true; if(typeof n==='string'&&n.startsWith('data-')){const key=n.slice(5).replace(/-([a-z])/g,(_,c)=>c.toUpperCase());this.dataset[key]=String(v);} if(n==='style'){const s=String(v);for(const d of s.split(';')){const c=d.indexOf(':');if(c>0){const k=d.slice(0,c).trim();const val=d.slice(c+1).trim();if(k)this.style.setProperty(k,val);}} } }
   getAttribute(n) { return this.attributes[n]!==undefined?this.attributes[n]:null; }
   removeAttribute(n) { delete this.attributes[n]; if(n==='disabled')this.disabled=false; }
   hasAttribute(n) { return n in this.attributes; }