Before the browser can render the page, it needs to construct the:

Before the browser can render the page, it needs to construct the:

• Pixel pipeline
• DOM and CSSOM trees
• UX trees
• HTML and JavaScript

Correct answer is:

• DOM and CSSOM trees

Explanation: Before the browser can render the page, it needs to construct the DOM and CSSOM trees. As a result, we need to ensure that we deliver both the HTML and CSS to the browser as quickly as possible.

Read more here: https://support.google.com/partners/answer/7336282