diff --git a/packages/sdk/src/core/goview/convert.ts b/packages/sdk/src/core/goview/convert.ts
index d0a1b86..a67c5c1 100644
--- a/packages/sdk/src/core/goview/convert.ts
+++ b/packages/sdk/src/core/goview/convert.ts
@@ -680,10 +680,75 @@ function pickNumberLikeInner(input: unknown, keys: string[], depth: number): num
   return undefined;
 }
 
+function looksLikeHtml(input: string): boolean {
+  const s = input.trim();
+  return s.startsWith('<') && s.includes('>');
+}
+
+function extractHtmlAttribute(html: string, name: string): string | undefined {
+  // eslint-disable-next-line no-useless-escape
+  const re = new RegExp(`\\b${name}\\s*=\\s*(?:\"([^\"]+)\"|'([^']+)'|([^\\s>]+))`, 'i');
+  const match = re.exec(html);
+  return match?.[1] ?? match?.[2] ?? match?.[3];
+}
+
+function parseHtmlSizeAttr(value: string | undefined): number | undefined {
+  if (!value) return undefined;
+  const v = value.trim();
+  // only accept plain numbers or px values; ignore %/auto/etc.
+  const m = /^([0-9]+(?:\.[0-9]+)?)(px)?$/i.exec(v);
+  if (!m) return undefined;
+  const n = Number(m[1]);
+  return Number.isFinite(n) && n > 0 ? n : undefined;
+}
+
+function pickHtmlStringDeep(input: unknown, depth = 2): string | undefined {
+  if (typeof input === 'string') return looksLikeHtml(input) ? input : undefined;
+  if (!input || typeof input !== 'object') return undefined;
+  const obj = input as Record<string, unknown>;
+
+  for (const key of [
+    'html',
+    'htmlContent',
+    'htmlString',
+    'iframeHtml',
+    'embedHtml',
+    'embedCode',
+    'iframeCode',
+    'iframeEmbed',
+    'embed',
+    'code',
+    'content',
+    'template',
+    'srcdoc',
+    'srcDoc',
+  ]) {
+    const v = obj[key];
+    if (typeof v === 'string' && looksLikeHtml(v)) return v;
+  }
+
+  if (depth <= 0) return undefined;
+  for (const nestKey of ['style', 'config', 'option', 'options', 'props', 'dataset', 'data']) {
+    const v = pickHtmlStringDeep(obj[nestKey], depth - 1);
+    if (v) return v;
+  }
+  return undefined;
+}
+
 function pickSizeLike(option: unknown): { w?: number; h?: number } {
   // goView-ish variants use different keys and sometimes nest them under style/config.
   const w = pickNumberLike(option, ['width', 'w']);
   const h = pickNumberLike(option, ['height', 'h']);
+
+  // Some forks store only an embed HTML snippet (iframe/video) with width/height.
+  // If attr sizing is missing, this helps us pick a better default rect.
+  const html = pickHtmlStringDeep(option, 3);
+  if (html) {
+    const wFromHtml = parseHtmlSizeAttr(extractHtmlAttribute(html, 'width'));
+    const hFromHtml = parseHtmlSizeAttr(extractHtmlAttribute(html, 'height'));
+    return { w: w ?? wFromHtml, h: h ?? hFromHtml };
+  }
+
   return { w, h };
 }