The “Most Disliked” CSS Feature: cos() and sin()

ByEditor

No single feature in CSS can be deemed “the worst,” as it’s subjective and based on personal experiences. However, if a consensus is needed, the State of CSS 2025 results could be a good point of reference. I checked the awards section and found the “Most Hated Feature,” a title no CSS feature should bear…

State of CSS screenshot revealing the survey's most hated CSS feature, trigonometric functions.

This surprises me. Are trigonometric functions really that disliked? “Hated” isn’t the same as “worst,” but it still sounds harsh. Although only “9.1% of respondents truly hate trigonometry,” it’s still too much negativity for my liking.

I want to change that 9.1%. In this series, I aim to explore practical uses for CSS trigonometric functions. We’ll break them down into manageable parts for easier understanding. We’ll start with the possibly most popular functions of the “worst” feature: sin() and cos().

CSS Trigon

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