Attributes are JavaScript

In HTML, attribute values are strings. In Marko, attribute values are JavaScript expressions. Even href="/about" is a JS string literal, not an HTML attribute string — which means everything else JavaScript can express works there too:

<a href=`/user/${user.id}`>My Profile</a>
<a href=getRandomPage()>Discover Something New</a>
<my-tag num=1 + 1 date=new Date()/>

No quotes needed around expressions. One caveat: an expression containing a bare > is ambiguous with the end of the tag, so wrap those in parentheses: value=(1 > 2).

Booleans behave the way you’d hope. HTML boolean attributes accept real booleans — <input checked=isDone> — and when a value is null, undefined, or false, Marko simply omits the attribute from the output. (Other falsy values like 0 and "" are still written.)

The page on the right lists a product. Make it honest:

1. The link’s href is hardcoded to /products/0 — build it from the product’s id with a template literal: href=`/products/${product.id}`.
2. The price paragraph should multiply instead of guessing: replace 59 with ${product.price * quantity}.
3. The buy button should be disabled when out of stock — give it disabled=!product.inStock and watch the attribute appear and disappear as you flip inStock at the top of the file.