What event triggers the 'page-start' hook in an SFCC storefront?

The 'page-start' hook in Salesforce Commerce Cloud (SFCC) is specifically designed to activate at the moment a page begins its rendering process in the storefront. This hook serves as an entry point for developers to execute any necessary logic or modifications right before the presentation of the page starts. It allows for early initialization tasks, such as setting up variables, adjusting contexts, or preparing data that is needed across the rendering lifecycle of the page.

In this context, it is important to understand the significance of the 'page-start' event as it encapsulates the initiation phase of the page lifecycle, setting the stage for subsequent rendering processes. Other events like clicking a product, submitting a form, or displaying a promotional banner do not relate directly to the rendering phase of a page, and therefore do not trigger the 'page-start' hook. These other interactions occur at different points in the user experience and are managed via different hooks or event handlers, which are streamlined for their specific functionalities.