diff --git a/posts/drafts/remove-tracking-params-from-links.md b/posts/drafts/remove-tracking-params-from-links.md
index 3a7c6f6..b91ea11 100644
--- a/posts/drafts/remove-tracking-params-from-links.md
+++ b/posts/drafts/remove-tracking-params-from-links.md
@@ -206,6 +206,319 @@ parts of a url:
 })();
 </script>
 
+## Understanding Query Parameters
+
+Query parameters are the part of a URL that comes after the `?`. They consist of key-value pairs that pass data to the page. Let's break down how they work:
+
+<style>
+.query-container {
+  margin: 1em 0;
+}
+
+.query-example {
+  font-family: monospace;
+  font-size: 1.2em;
+  padding: 1em;
+  background: var(--code-background, #f5f5f5);
+  border: 1px solid var(--border-color, #ddd);
+  border-radius: 8px;
+  margin-bottom: 1em;
+  overflow-x: auto;
+  white-space: nowrap;
+}
+
+.query-example span,
+.query-legend-item {
+  transition: opacity 0.2s, box-shadow 0.2s;
+  cursor: pointer;
+}
+
+.query-legend {
+  display: flex;
+  flex-direction: column;
+  gap: 0.75em;
+  padding: 1em;
+  background: var(--code-background, #f5f5f5);
+  border: 1px solid var(--border-color, #ddd);
+  border-radius: 8px;
+}
+
+.query-legend-item {
+  display: flex;
+  align-items: flex-start;
+  gap: 0.5em;
+}
+
+.query-legend-item .query-legend-label {
+  font-weight: 600;
+  min-width: 8em;
+}
+
+.query-legend-item[data-qparam] .query-legend-label {
+  min-width: auto;
+}
+
+.query-legend-item .query-legend-desc {
+  color: #666;
+  font-size: 0.9em;
+}
+
+.query-legend-color {
+  width: 1em;
+  height: 1em;
+  border-radius: 3px;
+  flex-shrink: 0;
+  margin-top: 0.2em;
+}
+
+/* Structure colors - each UNIQUE */
+.query-part-delimiter { color: #db2777; }
+.query-legend-delimiter { background: #db2777; }
+
+.query-part-key { color: #2563eb; }
+.query-legend-key { background: #2563eb; }
+
+.query-part-equals { color: #ca8a04; }
+.query-legend-equals { background: #ca8a04; }
+
+.query-part-value { color: #16a34a; }
+.query-legend-value { background: #16a34a; }
+
+.query-part-separator { color: #9333ea; }
+.query-legend-separator { background: #9333ea; }
+
+/* Parameter group highlighting in URL */
+.query-param-group {
+  display: inline;
+  border-radius: 0.25em;
+  transition: box-shadow 0.2s, background 0.2s;
+}
+
+.query-container.hovering .query-param-group.highlighted {
+  border-radius: 0.25em;
+  box-shadow: 
+    inset 0 0 0.5em 0.25em rgba(0, 0, 0, 0.06),
+    0 0 0.75rem 0.5rem rgba(0, 0, 0, 0.06),
+    0 0 1.25rem 1rem rgba(0, 0, 0, 0.04),
+    0 0 2rem 1.5rem rgba(0, 0, 0, 0.02);
+}
+
+/* Base: dim everything when hovering (NOT param-groups, only their children) */
+.query-container.hovering .query-example > span[data-qpart],
+.query-container.hovering .query-param-group > span[data-qpart],
+.query-container.hovering .query-legend-item {
+  opacity: 0.3;
+}
+
+/* Highlighted spans in URL */
+.query-container.hovering .query-example span[data-qpart].highlighted {
+  opacity: 1 !important;
+  border-radius: 0.25em;
+  box-shadow: 
+    inset 0 0 0.5em 0.25em rgba(0, 0, 0, 0.06),
+    0 0 0.75rem 0.5rem rgba(0, 0, 0, 0.06),
+    0 0 1.25rem 1rem rgba(0, 0, 0, 0.04),
+    0 0 2rem 1.5rem rgba(0, 0, 0, 0.02);
+}
+
+/* Spans inside highlighted param groups should have full opacity */
+.query-container.hovering .query-param-group.highlighted > span[data-qpart] {
+  opacity: 1 !important;
+}
+
+.query-container .query-legend-item.highlighted {
+  opacity: 1 !important;
+  padding: 0.5em 0.75em;
+  margin: -0.5em -0.75em;
+  border-radius: 0.5em;
+  box-shadow: 
+    inset 0 0 0.5em 0.25em rgba(0, 0, 0, 0.06),
+    0 0 0.75rem 0.5rem rgba(0, 0, 0, 0.06),
+    0 0 1.25rem 1rem rgba(0, 0, 0, 0.04),
+    0 0 2rem 1.5rem rgba(0, 0, 0, 0.02);
+}
+
+.query-legend-section {
+  margin-top: 1em;
+  padding-top: 0.75em;
+  border-top: 1px solid var(--border-color, #ddd);
+}
+
+.query-legend-section-title {
+  font-weight: 600;
+  font-size: 0.85em;
+  color: #666;
+  margin-bottom: 0.5em;
+}
+
+/* Parameter legend labels - styled as code blocks */
+.query-param-label {
+  font-family: monospace;
+  font-size: 0.9em;
+  background: var(--inline-code-background, rgba(0, 0, 0, 0.06));
+  padding: 0.15em 0.4em;
+  border-radius: 4px;
+  border: 1px solid var(--border-color, rgba(0, 0, 0, 0.1));
+  min-width: auto;
+}
+</style>
+
+<div class="query-container" id="query-container">
+<div class="query-example" role="figure" aria-label="Query parameter example">
+  <span class="query-part-delimiter" data-qpart="delimiter">?</span><span class="query-param-group" data-qparam="size"><span class="query-part-key" data-qpart="key" data-qparam="size">size</span><span class="query-part-equals" data-qpart="equals" data-qparam="size">=</span><span class="query-part-value" data-qpart="value" data-qparam="size">medium</span></span><span class="query-part-separator" data-qpart="separator">&</span><span class="query-param-group" data-qparam="color"><span class="query-part-key" data-qpart="key" data-qparam="color">color</span><span class="query-part-equals" data-qpart="equals" data-qparam="color">=</span><span class="query-part-value" data-qpart="value" data-qparam="color">light%20blue</span></span><span class="query-part-separator" data-qpart="separator">&</span><span class="query-param-group" data-qparam="utm"><span class="query-part-key" data-qpart="key" data-qparam="utm">utm_source</span><span class="query-part-equals" data-qpart="equals" data-qparam="utm">=</span><span class="query-part-value" data-qpart="value" data-qparam="utm">facebook</span></span><span class="query-part-separator" data-qpart="separator">&</span><span class="query-param-group" data-qparam="fbclid"><span class="query-part-key" data-qpart="key" data-qparam="fbclid">fbclid</span><span class="query-part-equals" data-qpart="equals" data-qparam="fbclid">=</span><span class="query-part-value" data-qpart="value" data-qparam="fbclid">abc123xyz</span></span>
+</div>
+
+<div class="query-legend" role="list" aria-label="Query parameter legend">
+  <div class="query-legend-section-title">Structure</div>
+  <div class="query-legend-item" role="listitem" data-qpart="delimiter">
+    <span class="query-legend-color query-legend-delimiter" aria-hidden="true"></span>
+    <span class="query-legend-label query-label-delimiter">? Delimiter</span>
+    <span class="query-legend-desc">Marks the start of query parameters in a URL</span>
+  </div>
+  <div class="query-legend-item" role="listitem" data-qpart="key">
+    <span class="query-legend-color query-legend-key" aria-hidden="true"></span>
+    <span class="query-legend-label query-label-key">Key</span>
+    <span class="query-legend-desc">The name of the data being passed</span>
+  </div>
+  <div class="query-legend-item" role="listitem" data-qpart="equals">
+    <span class="query-legend-color query-legend-equals" aria-hidden="true"></span>
+    <span class="query-legend-label query-label-equals">= Assignment</span>
+    <span class="query-legend-desc">Connects each key to its value</span>
+  </div>
+  <div class="query-legend-item" role="listitem" data-qpart="value">
+    <span class="query-legend-color query-legend-value" aria-hidden="true"></span>
+    <span class="query-legend-label query-label-value">Value</span>
+    <span class="query-legend-desc">The actual data being passed</span>
+  </div>
+  <div class="query-legend-item" role="listitem" data-qpart="separator">
+    <span class="query-legend-color query-legend-separator" aria-hidden="true"></span>
+    <span class="query-legend-label query-label-separator">& Separator</span>
+    <span class="query-legend-desc">Separates multiple key-value pairs</span>
+  </div>
+  
+  <div class="query-legend-section">
+    <div class="query-legend-section-title">Parameters in this example</div>
+  </div>
+  <div class="query-legend-item" role="listitem" data-qparam="size">
+    <span class="query-legend-label query-param-label">size=medium</span>
+    <span class="query-legend-desc">Useful parameter — tells the page which size to select</span>
+  </div>
+  <div class="query-legend-item" role="listitem" data-qparam="color">
+    <span class="query-legend-label query-param-label">color=light%20blue</span>
+    <span class="query-legend-desc">Useful parameter — tells the page which color variant to show</span>
+  </div>
+  <div class="query-legend-item" role="listitem" data-qparam="utm">
+    <span class="query-legend-label query-param-label">utm_source=facebook</span>
+    <span class="query-legend-desc">⚠️ Tracking parameter — tells the site you came from Facebook</span>
+  </div>
+  <div class="query-legend-item" role="listitem" data-qparam="fbclid">
+    <span class="query-legend-label query-param-label">fbclid=abc123xyz</span>
+    <span class="query-legend-desc">⚠️ Tracking parameter — Facebook's click ID to track your activity</span>
+  </div>
+</div>
+</div>
+
+<script>
+(function() {
+  const container = document.getElementById('query-container');
+  const queryExample = container.querySelector('.query-example');
+  const exampleSpans = container.querySelectorAll('.query-example span[data-qpart]');
+  const paramGroups = container.querySelectorAll('.query-param-group');
+  const legendItems = container.querySelectorAll('.query-legend-item');
+  
+  function clearHighlights() {
+    container.classList.remove('hovering');
+    exampleSpans.forEach(s => s.classList.remove('highlighted'));
+    paramGroups.forEach(g => g.classList.remove('highlighted'));
+    legendItems.forEach(l => l.classList.remove('highlighted'));
+  }
+  
+  // Hovering spans in the example URL - highlight only that single element + related legend items
+  exampleSpans.forEach(span => {
+    span.addEventListener('mouseenter', (e) => {
+      e.stopPropagation(); // Prevent parent group from triggering
+      clearHighlights();
+      container.classList.add('hovering');
+      
+      // Highlight only THIS span
+      span.classList.add('highlighted');
+      
+      // Highlight the Structure legend item for this part type
+      const qpart = span.dataset.qpart;
+      if (qpart) {
+        legendItems.forEach(item => {
+          if (item.dataset.qpart === qpart) {
+            item.classList.add('highlighted');
+          }
+        });
+      }
+      
+      // Highlight the Parameter legend item for this parameter
+      const qparam = span.dataset.qparam;
+      if (qparam) {
+        legendItems.forEach(item => {
+          if (item.dataset.qparam === qparam) {
+            item.classList.add('highlighted');
+          }
+        });
+      }
+    });
+    span.addEventListener('mouseleave', clearHighlights);
+  });
+  
+  // Hovering legend items
+  legendItems.forEach(item => {
+    item.addEventListener('mouseenter', () => {
+      clearHighlights();
+      container.classList.add('hovering');
+      
+      // Highlight this legend item
+      item.classList.add('highlighted');
+      
+      const qpart = item.dataset.qpart;
+      const qparam = item.dataset.qparam;
+      
+      // Structure legend: highlight ALL matching URL parts
+      if (qpart) {
+        exampleSpans.forEach(span => {
+          if (span.dataset.qpart === qpart) {
+            span.classList.add('highlighted');
+          }
+        });
+      }
+      
+      // Parameter legend (example): highlight the param GROUP container
+      if (qparam) {
+        paramGroups.forEach(group => {
+          if (group.dataset.qparam === qparam) {
+            group.classList.add('highlighted');
+          }
+        });
+      }
+      
+      // Scroll to first matching element
+      let scrollTarget = null;
+      if (qpart) {
+        const firstPart = container.querySelector('.query-example [data-qpart="' + qpart + '"]');
+        if (firstPart) scrollTarget = firstPart;
+      } else if (qparam) {
+        const group = container.querySelector('.query-param-group[data-qparam="' + qparam + '"]');
+        if (group) scrollTarget = group;
+      }
+      
+      if (scrollTarget) {
+        const containerRect = queryExample.getBoundingClientRect();
+        const partRect = scrollTarget.getBoundingClientRect();
+        const partCenter = partRect.left - containerRect.left + queryExample.scrollLeft + (partRect.width / 2);
+        const scrollPos = partCenter - (containerRect.width / 2);
+        queryExample.scrollTo({ left: scrollPos, behavior: 'smooth' });
+      }
+    });
+    item.addEventListener('mouseleave', clearHighlights);
+  });
+})();
+</script>
+
 explain what each part does
 
 explain why a website would want to use query parameters