Pause page

Instantly pause the page when DevTools is open using a keyboard shortcut. This makes it easy to inspect an element at a specific point in time. For example, for elements like popovers or dropdowns, visibility is often controlled using JavaScript events like `mousemove`/`mouseleave`, so when we try to inspect these elements, they disappear from the page because the cursor moved or keyboard focus changed. If we pause the page once the element is visible then it won't disappear when we move the cursor or change keyboard focus, thereby allowing us to inspect the element and its styles.