Exercise 3: Why the Variable Product Needed Its Own CWV Check — Possible Solution
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WHAT'S DIFFERENT ABOUT THE SIGNATURE SCENT TRIO
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Per this course's own Chapter 9 material, a Variable product's price
and stock status change dynamically as the shopper selects different
attributes - here, different Scent and Size combinations. The
Vanilla Bean, Single Wick is a Simple product with exactly one price
and one stock status that never changes based on any on-page
selection, so there is no equivalent dynamic content on its page at
all.

WHY THIS CREATES A CLS RISK SPECIFICALLY FOR THE TRIO
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Per Chapter 9, if the space for the price/stock text isn't reserved
ahead of time, the surrounding page content shifts each time the
displayed price or stock text changes length or appears/disappears in
response to a variation selection - this is exactly what Cumulative
Layout Shift measures, and it can only occur on a page where a
selection can actually change what's displayed, which the Trio's page
has and the Single Wick's page doesn't.

WHY THE CAPSTONE'S STEP 8 CHECK TARGETS THE TRIO SPECIFICALLY
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Per this capstone, Step 8 confirms "the Signature Scent Trio's
variation-selector area is confirmed to reserve stable space for
price/stock text, avoiding the CLS risk Chapter 9 named for Variable
products specifically" - the check is scoped to the Trio because the
underlying risk itself only applies to Variable products, not because
of an arbitrary choice to test one product over another.

WHY THIS WORKS AS AN ANSWER
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It correctly identifies the variation-selection mechanism as the
source of the CLS risk, correctly explains why a Simple product has no
equivalent risk, and correctly connects that difference to why the
capstone's own Step 8 check specifically targets the Variable product.