How is the frontend header's «Sign In» link rendered?

Development Rendering
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Layout

Default layout

The default Magento_Customer module’s layout places the «Sign In» link (with the internal name authorization-link) inside the top.links block:

Luma theme

The Magento 2 default design theme (Luma) creates another «Sign In» link (with the internal name authorization-link-login) and places it inside the header.links block:

Then, the Luma design theme moves the top.links block inside the customer block:

So, the original «Sign In» link (with the internal name authorization-link) is not visible because the customer block is visible only to the authenticated visitors:

Also, the Luma design theme contains an odd nonsense move instruction:

It has no sense, because the authorization-link is already inside the top.links block, as it defined in the the default Magento_Customer module’s layout:

Template

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See also: