Step 2 of this exercise says that we removed the header “from the flow” of the document. What does this mean?

Question

Step 2 of this exercise says that we removed the header “from the flow” of the document. What does this mean?

Answer

This means that the <header> element no longer defaults to pushing it’s sibling elements beneath it. After we fix the <header> element’s position in step 1, the element now remains stuck to the top of the page even as we scroll.