Use camelCase for Style Binding Properties

Rule

When using :style bindings in Vue, prefer camelCase property names over kebab-case for consistency with JavaScript object syntax and better IDE support.

Why This Matters

camelCase is the standard JavaScript convention for object properties
Kebab-case properties require quotes, adding visual noise
IDE autocomplete and type checking work better with camelCase
Consistent with how CSS properties are accessed via element.style in JavaScript
Vue's auto-prefixing works with both, but camelCase is cleaner

Bad Code

<template>
  <!-- Requires quotes, harder to read -->
  <div
    :style="{
      'font-size': fontSize + 'px',
      'background-color': bgColor,
      'margin-top': marginTop + 'px',
      'z-index': zIndex,
    }"
  >
    Content
  </div>
</template>

Good Code

<template>
  <!-- Clean camelCase syntax -->
  <div
    :style="{
      fontSize: fontSize + 'px',
      backgroundColor: bgColor,
      marginTop: marginTop + 'px',
      zIndex: zIndex,
    }"
  >
    Content
  </div>
</template>

With Computed Properties

<script setup>
import { computed } from 'vue';

const props = defineProps({
  width: Number,
  height: Number,
  isVisible: Boolean,
});

// camelCase throughout
const containerStyle = computed(() => ({
  width: `${props.width}px`,
  height: `${props.height}px`,
  opacity: props.isVisible ? 1 : 0,
  transition: 'opacity 0.3s ease',
}));
</script>

<template>
  <div :style="containerStyle">Content</div>
</template>

Auto-Prefixing with Multiple Values

Vue automatically detects and applies vendor prefixes. For properties that need multiple values for cross-browser support, use an array:

<template>
  <!-- Vue will use the last value supported by the browser -->
  <div :style="{ display: ['-webkit-box', '-ms-flexbox', 'flex'] }">Flexbox content</div>
</template>

Combining Static and Dynamic Styles

The :style directive can coexist with the regular style attribute:

<template>
  <!-- Static styles + dynamic styles are merged -->
  <div style="border: 1px solid gray" :style="{ backgroundColor: dynamicColor }">Content</div>
</template>

Merging Multiple Style Objects

Use array syntax to merge multiple style objects:

<script setup>
const baseStyles = {
  padding: '10px',
  borderRadius: '4px',
};

const themeStyles = computed(() => ({
  backgroundColor: isDark.value ? '#333' : '#fff',
  color: isDark.value ? '#fff' : '#333',
}));
</script>

<template>
  <!-- Later objects override earlier ones for conflicting properties -->
  <div :style="[baseStyles, themeStyles]">Content</div>
</template>

References

Class and Style Bindings - Binding Inline Styles

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