Reported from ZenDesk ticket #9118 🔒.

The Extended header with megamenu template that gets compiled via npm run html:build is compiling without errors but it's missing the class usa-megamenu class.

This causes the Extended header with megamenu code example on Site to be inaccurate.

Steps to reproduce

USWDS-Site

1. Go to Extended header with megamenu code example on Site
2. Confirm that the usa-nav__submenu is missing usa-megamenu class and required HTML children for layout.

USWDS

1. Go to develop branch
2. Run npm run build:html
3. Go to html-templates directory
4. Open usa-header--extended-megamenu.html
5. Confirm missing usa-megamenu class and incorrect children to submenu.