input.field_with_errors, select.field_with_errors, textarea.field_with_errors {

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Single Line Per Selector

Rule single-line-per-selector will enforce whether selectors should be placed on a new line.

Examples

When enabled, the following are allowed:

.foo,
.bar {
  content: 'baz';
}

When enabled, the following are disallowed:

.foo, .bar {
  content: 'baz';
}

.pagination .active .page-link {

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Force Element Nesting

Rule force-element-nesting will enforce the nesting of elements

Examples

When enabled, the following are disallowed:

div p {
  content: '';
}

.parent {
  &__child h1 {
    content: '';
  }
}

a[target="_blank"] span {
  content: '';
}

When enabled, the following are allowed:

div {
  p {
    content: '';
  }
}

.parent {
  &__child {
    h1 {
      content: '';
    }
  }
}

a[target="_blank"] {
  span {
    content: '';
  }
}

input.field_with_errors, select.field_with_errors, textarea.field_with_errors {

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Force Element Nesting

Rule force-element-nesting will enforce the nesting of elements

Examples

When enabled, the following are disallowed:

div p {
  content: '';
}

.parent {
  &__child h1 {
    content: '';
  }
}

a[target="_blank"] span {
  content: '';
}

When enabled, the following are allowed:

div {
  p {
    content: '';
  }
}

.parent {
  &__child {
    h1 {
      content: '';
    }
  }
}

a[target="_blank"] {
  span {
    content: '';
  }
}

  padding:          0.3em 0.5em;

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Leading Zero

Rule leading-zero will enforce whether or not decimal numbers should include a leading zero.

Options

• include: true/false (defaults to false)

Examples

When include: false, the following are allowed. When include: true, the following are disallowed:

.foo {
  font-size: .5em;
}

When include: true, the following are allowed. When include: false, the following are disallowed:

.foo {
  font-size: 0.5em;
}

footer a {

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Force Element Nesting

Rule force-element-nesting will enforce the nesting of elements

Examples

When enabled, the following are disallowed:

div p {
  content: '';
}

.parent {
  &__child h1 {
    content: '';
  }
}

a[target="_blank"] span {
  content: '';
}

When enabled, the following are allowed:

div {
  p {
    content: '';
  }
}

.parent {
  &__child {
    h1 {
      content: '';
    }
  }
}

a[target="_blank"] {
  span {
    content: '';
  }
}

  padding:          0 0.5em 1em;

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Leading Zero

Rule leading-zero will enforce whether or not decimal numbers should include a leading zero.

Options

• include: true/false (defaults to false)

Examples

When include: false, the following are allowed. When include: true, the following are disallowed:

.foo {
  font-size: .5em;
}

When include: true, the following are allowed. When include: false, the following are disallowed:

.foo {
  font-size: 0.5em;
}

  border-bottom:  1px solid #dddddd;

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Hex Length

Rule hex-length will enforce the length of hexadecimal values

Options

• style: short/long (defaults to short)

Examples

When style: short, the following are allowed. When style: long, the following are disallowed:

$foo-color: #456;

.bar {
  background: linear-gradient(top, #3ff, #ddd);
}

.baz {
  color: #fff;
}

When style: long, the following are allowed. When style: short, the following are disallowed:

$foo-color: #445566;

.bar {
  background: linear-gradient(top, #33ffff, #dddddd);
}

.baz {
  color: #ffffff;
}

In both cases the following will be allowed as the values cannot be shortened:

$quz-color: #abcdef;

.qux {
  color: #123456;
}

  margin-left:      0.5em;

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Leading Zero

Rule leading-zero will enforce whether or not decimal numbers should include a leading zero.

Options

• include: true/false (defaults to false)

Examples

When include: false, the following are allowed. When include: true, the following are disallowed:

.foo {
  font-size: .5em;
}

When include: true, the following are allowed. When include: false, the following are disallowed:

.foo {
  font-size: 0.5em;
}

  font-size:    0.8em;

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Leading Zero

Rule leading-zero will enforce whether or not decimal numbers should include a leading zero.

Options

• include: true/false (defaults to false)

Examples

When include: false, the following are allowed. When include: true, the following are disallowed:

.foo {
  font-size: .5em;
}

When include: true, the following are allowed. When include: false, the following are disallowed:

.foo {
  font-size: 0.5em;
}

  padding:        0.5em;

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Leading Zero

Rule leading-zero will enforce whether or not decimal numbers should include a leading zero.

Options

• include: true/false (defaults to false)

Examples

When include: false, the following are allowed. When include: true, the following are disallowed:

.foo {
  font-size: .5em;
}

When include: true, the following are allowed. When include: false, the following are disallowed:

.foo {
  font-size: 0.5em;
}

input.field_with_errors, select.field_with_errors, textarea.field_with_errors {

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Class Name Format

Rule class-name-format will enforce a convention for class names.

Options

• allow-leading-underscore: true/false (defaults to true)
• convention: 'hyphenatedlowercase' (default), camelcase, snakecase, strictbem, hyphenatedbem, or a Regular Expression that the class name must match (e.g. ^[_A-Z]+$)
• convention-explanation: Custom explanation to display to the user if a class doesn't adhere to the convention
• ignore: Array of names to ignore

Example 1

Settings: - allow-leading-underscore: true - convention: hyphenatedlowercase

When enabled, the following are allowed:

.hyphenated-lowercase {
  content: '';

  &._with-leading-underscore {
    content: '';
  }
}

.foo {
  @extend .hyphenated-lowercase;
}

When enabled, the following are disallowed:

.HYPHENATED-UPPERCASE {
  content: '';
}

.camelCase {
  content: '';

  @extend .snake_case;
}

Example 2

Settings: - allow-leading-underscore: false - convention: hyphenatedlowercase

When enabled, the following are allowed:

.hyphenated-lowercase {
  content: '';

  &.another-hyphenated-lowercase {
    content: '';
  }
}

.foo {
  @extend .hyphenated-lowercase;
}

When enabled, the following are disallowed:

._with-leading-underscore {
  content: '';
}

.HYPHENATED-UPPERCASE {
  content: '';
}

.camelCase {
  content: '';

  @extend .snake_case;
}

Example 3

Settings: - convention: camelcase

When enabled, the following are allowed:

.camelCase {
  content: '';
}

.foo {
  @extend .anotherCamelCase;
}

When enabled, the following are disallowed:

.HYPHENATED-UPPERCASE {
  content: '';
}

.foo {
  @extend .snake_case;
}

Example 4

Settings: - convention: pascalcase

When enabled, the following are allowed:

.PascalCase {
  content: '';
}

.Foo {
  @extend .AnotherPascalCase;
}

When enabled, the following are disallowed:

.HYPHENATED-UPPERCASE {
  content: '';
}

.foo {
  @extend .snake_case;
}

Example 5

Settings: - convention: snakecase

When enabled, the following are allowed:

.snake_case {
  content: '';
}

.foo {
  @extend .another_snake_case;
}

When enabled, the following are disallowed:

.HYPHENATED-UPPERCASE {
  content: '';
}

.foo {
  @extend .camelCase;
}

Example 6

Settings: - convention: strictbem

When enabled, the following are allowed:

.block-name__elem-name {
  content: '';
}

.owner-name_mod-name_mod-val {
  content: '';
}

.block-name__elem-name_mod-bool {
  content: '';
}

When enabled, the following are disallowed:

.HYPHENATED-UPPERCASE {
  content: '';
}

.foo {
  @extend .camelCase;
}

Example 7

Settings: - convention: hyphenatedbem

When enabled, the following are allowed:

.site-search {
  color: blue;
  width: 50px;
  height: 100%;
}

.site-search__field {
  text-decoration: underline;
}

.site-search--full {
  color: green;
}

When enabled, the following are disallowed:

.HYPHENATED-UPPERCASE {
  content: '';
}

.foo {
  @extend .camelCase;
}

Example 8

Settings: - convention: ^[_A-Z]+$ - convention-explanation: 'Class must contain only uppercase letters and underscores'

When enabled, the following are allowed:

.SCREAMING_SNAKE_CASE {
  content: '';
}

.foo {
  @extend .SCREAMING_SNAKE_CASE;
}

When enabled, the following are disallowed:

(Each line with a class will report Class must contain only uppercase letters and underscores when linted.)

.HYPHENATED-UPPERCASE {
  content: '';
}

.snake_case {
  content: '';
}

.foo {
  @extend .camelCase;
}

.c-sidebar-brand img {

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Force Element Nesting

Rule force-element-nesting will enforce the nesting of elements

Examples

When enabled, the following are disallowed:

div p {
  content: '';
}

.parent {
  &__child h1 {
    content: '';
  }
}

a[target="_blank"] span {
  content: '';
}

When enabled, the following are allowed:

div {
  p {
    content: '';
  }
}

.parent {
  &__child {
    h1 {
      content: '';
    }
  }
}

a[target="_blank"] {
  span {
    content: '';
  }
}

.top-nav li {

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Force Element Nesting

Rule force-element-nesting will enforce the nesting of elements

Examples

When enabled, the following are disallowed:

div p {
  content: '';
}

.parent {
  &__child h1 {
    content: '';
  }
}

a[target="_blank"] span {
  content: '';
}

When enabled, the following are allowed:

div {
  p {
    content: '';
  }
}

.parent {
  &__child {
    h1 {
      content: '';
    }
  }
}

a[target="_blank"] {
  span {
    content: '';
  }
}

  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.75), inset 0 2px 0 0 rgba(255, 192, 192, 0.5), inset 0 0 0 2px rgba(255, 96, 96, 0.85), 3px 3px 3px 1px rgba(0, 0, 0, 0.15);

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Leading Zero

Rule leading-zero will enforce whether or not decimal numbers should include a leading zero.

Options

• include: true/false (defaults to false)

Examples

When include: false, the following are allowed. When include: true, the following are disallowed:

.foo {
  font-size: .5em;
}

When include: true, the following are allowed. When include: false, the following are disallowed:

.foo {
  font-size: 0.5em;
}

  background-image: -ms-linear-gradient(top, $button-bg, $button-bg-active);

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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;
}

.table-striped th.page {

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Force Element Nesting

Rule force-element-nesting will enforce the nesting of elements

Examples

When enabled, the following are disallowed:

div p {
  content: '';
}

.parent {
  &__child h1 {
    content: '';
  }
}

a[target="_blank"] span {
  content: '';
}

When enabled, the following are allowed:

div {
  p {
    content: '';
  }
}

.parent {
  &__child {
    h1 {
      content: '';
    }
  }
}

a[target="_blank"] {
  span {
    content: '';
  }
}

  padding:          0.2em 0.6em 0.2em 1.2em;

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Leading Zero

Rule leading-zero will enforce whether or not decimal numbers should include a leading zero.

Options

• include: true/false (defaults to false)

Examples

When include: false, the following are allowed. When include: true, the following are disallowed:

.foo {
  font-size: .5em;
}

When include: true, the following are allowed. When include: false, the following are disallowed:

.foo {
  font-size: 0.5em;
}

  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.75), inset 0 2px 0 0 rgba(255, 192, 192, 0.5), inset 0 0 0 2px rgba(255, 96, 96, 0.85), 3px 3px 3px 1px rgba(0, 0, 0, 0.15);

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Leading Zero

Rule leading-zero will enforce whether or not decimal numbers should include a leading zero.

Options

• include: true/false (defaults to false)

Examples

When include: false, the following are allowed. When include: true, the following are disallowed:

.foo {
  font-size: .5em;
}

When include: true, the following are allowed. When include: false, the following are disallowed:

.foo {
  font-size: 0.5em;
}

  color:            $white !important;

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No Important

Rule no-important will enforce that important declarations are not allowed to be used.

Examples

When enabled, the following are disallowed:

.foo {
  content: 'bar' !important;
}

nav ul, .sidebar ul, .header ul, .footer ul {

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Force Element Nesting

Rule force-element-nesting will enforce the nesting of elements

Examples

When enabled, the following are disallowed:

div p {
  content: '';
}

.parent {
  &__child h1 {
    content: '';
  }
}

a[target="_blank"] span {
  content: '';
}

When enabled, the following are allowed:

div {
  p {
    content: '';
  }
}

.parent {
  &__child {
    h1 {
      content: '';
    }
  }
}

a[target="_blank"] {
  span {
    content: '';
  }
}