Selectutorial - CSS selectors. Descendant selectors. Descendant selectors are used to select elements that are descendants of another element in the document tree. For example, you may wish to target a specific <strong> element on the page, but not all <strong> elements. However, if you use a descendant selector, you can refine the <strong> elements that you select.
Throw is an irregular verb. Throwed is not the past tense. Threw is the past tense.
The first for is grammatically correct. When you use the past simple form of the verb 'DO' the the verb which follows remains in the infinitive form. For example, we say ' He did walk' and NOT ' He did walked'.