How Can I Effectively Debug CSS `calc()` Values?

CSS Calc() Value Debugging

Problem: Debugging complex CSS calc() formulas can be challenging.

How to Validate/Highlight Formula Errors:

• Ensure that your formula adheres to the following rules:

  • No addition/subtraction of different types (e.g., px and s).
  • For multiplication, one side must be a number.
  • For division, the right side must be a nonzero number.
  • White space is required on both sides of and - operators.

How to Debug Calculated Value:

• You cannot directly access the "final" computed value because it varies depending on the property.
• Use JavaScript to get the computed value of specific properties:

var elem = document.querySelector(".box");
var prop = window.getComputedStyle(elem, null).getPropertyValue("--variable");
var height = window.getComputedStyle(elem, null).getPropertyValue("height");
console.log(prop);
console.log(height);

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