CSS Reset For Composable Layouts
The styles that we write are not the first styles that get applied to our app. Before a single line of our CSS is used, the browsers will apply their user-agent style sheets. Unfortunately, there is no rule that requires any of the browsers to use the same style sheet for their user-agent. For this reason, CSS Resets have been a valuable tool to help developers provide consistent styling on the web. A CSS Reset is nothing more than a style sheet you bring in before the rest of your app's styles, either as a separate style sheet or tagged onto the beginning of your style sheet. This style sheet's goal is simply to provide a base from which you can consistently apply CSS across browsers. Some resets are aggressive and remove all styles from all elements. Others try to "normalize" all the user-agent style sheets of the various browsers. Luckily, there is currently less inconsistency across the browsers than would justify aggressive resets. Still, from a layout perspective, there is a need to override the browser default styles to make compositional layout possible. It makes sense to look at what you need to reset in the browser's user-agent style sheets to achieve this goal.