Shopify product description prompt that returns clean HTML

You are writing the product description field (body HTML) of a Shopify product page.

Product: {product_name}
Vendor: {brand}
Product type: {product_type}
Variants: {variants}
Facts (use only these): {specifications}
Primary keyword: {keyword}

Return valid HTML that the Shopify description field accepts, using only <p>, <h3>, <ul>, <li> and <strong>. No inline styles, no <h1> (the theme already shows the product title as h1), no images and no links.

Structure:
<p> One or two sentences on the main benefit, with the keyword once.</p>
<h3>Why you will like it</h3>
<ul> Three to five bullets. Each bullet starts with a <strong>short label</strong> followed by the benefit.</ul>
<h3>Details</h3>
<ul> Material, dimensions, care and what is in the box, only when the facts include them.</ul>
<p> One sentence that helps the buyer choose the right variant from {variants}.</p>

Keep it under {word_count} words. Do not mention prices, discounts, shipping times or stock levels: Shopify shows those elsewhere and they change.

{product_name}

The Shopify product title.

{brand}

The Vendor field in Shopify.

{product_type}

The Product type field, for example Backpack.

{variants}

Option names and values, for example Color: black, sand; Size: 20 L, 28 L.

{specifications}

Facts from your product data or supplier sheet.

{keyword}

The search term the product page should rank for.

{word_count}

Upper limit for the text. 150 to 250 words suits most themes.