Debugging CSS: A Systematic Approach I Rely On
CSS bugs can be frustrating to track down. Here is the methodical checklist I use to diagnose and fix layout issues in minutes. I have been debugging CSS long enough to have developed a methodical approach. When something is not rendering the way I expect, I do not randomly tweak properties hoping something sticks. I follow a systematic checklist that usually identifies the problem within a few minutes. Step One: Check Computed Styles I open the browser DevTools and inspect the computed styles panel. Is the CSS property I expect actually being applied to the element? If the property appears but is crossed out, another rule with higher specificity is overriding it. If the property does not appear at all, either the selector does not match the element or the property value is invalid. /* Common reasons a property is crossed out in DevTools: 1. Another rule with higher specificity overrides it 2. A later rule with equal specificity overrides it 3. An inline style overrides it 4!important on another rule overrides it 5. A cascade layer with lower priority */ When a property is crossed out, I trace the overriding rule by…