What does it mean to: "adjust HTML codes to absolute values" ?

Answer 1

Most likely this is referring to the positioning of the HTML elements. Specifically, HTML layouts can be relative or absolute.

Relative means each subsequent element's position is determined relative to the element preceding it. For example, if you have a paragraph 200 pixels tall, and then an image 100 pixels tall, the element directly after the image, if positioned relatively, will be 300 pixels from the top of the browser window.

Absolute positioning is done by positioning each element independently, relative to the dimensions of the browser. You set your first item to be 0 pixels down from the top of the browser window, the second item to be 200 pixels down from the top of the window, and the third item to be 300 pixels from the top of the window.

Absolute positioning is usually a bad idea; it assumes that you have absolute control over the dimensions of every element in the page - which, usually, you don't. Text changes, users with different native font sizes, etc. can all affect the size of your elements. It is almost always better to position as relatively as possible.