No Duplicate Properties

Rule no-duplicate-properties will enforce that duplicate properties are not allowed within the same block.

Options

• exclude: [array of property names to be excluded from this rule] (defaults to empty array [])

Examples

When enabled, the following are disallowed:

.foo {
  margin: 0 0 15px;
  margin: 0;
}

Exclude

When a property is added to the exclude array as shown below then you may place duplicate properties immediately after one another, this is to prevent accidental duplication of properties.

no-duplicate-properties:
  - 1
  -
    exclude:
      - display

When display is added to the exclude array the following would be allowed:

.display-block {
  display: flex;
  display: inline-block;
  float: right;
}

When display is added to the exclude array the following would still be disallowed as the duplicate properties are separated by another property:

.display-block {
  display: flex;
  float: right;
  display: inline-block;
}

No Vendor Prefixes

Rule no-vendor-prefixes will enforce that vendor prefixes are not allowed to be used.

List of prefixes affected by default: * webkit * moz * ms

Options

• additional-identifiers: [array of additional prefixes to check for] (defaults to empty array [])
• excluded-identifiers: [array of prefixes to exclude checking for] (defaults to empty array [])
• ignore-non-standard: true:false (defaults to false)

Examples

When enabled, the following are disallowed:

@-webkit-keyframes anim {
  0% { opacity: 0; }
}

.ms-block {
  -ms-hyphenate-limit-lines: no-limit;
}

::-moz-placeholder {
  content: '';
}

.foo {
  -webkit-transition: none;
}

.bar {
  position: -moz-sticky;
}

Additional Identifiers

When additional-identifiers contains a custom prefix value of khtml as show below

no-vendor-prefixes:
  - 1
  -
    additional-identifiers:
      - khtml

The following would now also be disallowed

.baz {
  position: -khtml-sticky;
}

Excluded Identifiers

When excluded-identifiers contains currently disallowed prefix values such as webkit and moz as show below

no-vendor-prefixes:
  - 1
  -
    excluded-identifiers:
      - webkit
      - moz

The following would now be allowed

@-webkit-keyframes anim {
  0% { opacity: 0; }
}

::-moz-placeholder {
  content: '';
}

.foo {
  -webkit-transition: none;
}

.bar {
  position: -moz-sticky;
}

While the following would remain disallowed

.ms-block {
  -ms-hyphenate-limit-lines: no-limit;
}

Ignore Non Standard

ignore-non-standard is an option that allows you to specify whether only standard properties from our properties list should be affected by this rule or if any prefixed property / element should be affected.

When ignore-non-standard is set to false the following are disallowed, when ignore-non-standard is set to true the following are allowed:

html {
  -webkit-tap-highlight-color: $link-color-hover;
}

button::-moz-focus-inner,
input::-moz-focus-inner {
  border: 0;
  padding: 0;
}

input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  height: auto;
}