Single template merge-tag contract

Single templates render one current post/product. Common tags include:

• post_id, title, content, excerpt, permalink, date, modified, author_name;
• featured_image;
• meta name="…";
• image_from_meta name="…";
• gallery meta_name="…";
• posts_nav;
• icon;
• translatable_string;
• conditional if / else blocks.

Optional values need a condition or fallback. Password-protected content retains the WordPress password form instead of leaking the protected body through a fallback.

Example

<article>
  {{featured_image}}
  <h1>{{title}}</h1>
  {{content}}
</article>

Use meta only for a known field owned by the content model. Match the rendering helper to the value: a plain meta value is not interchangeable with an attachment ID, gallery, URL, or reusable-content reference.

Preview a published post with complete data, one with optional data missing, one with a very long title, and a password-protected post. If WooCommerce-specific output is used, also test a product with unavailable price/media data and the relevant product visibility state.

See Single template merge tags for exact attributes and examples.