How to create a SASS mixin for placeholders that handles static CSS without errors?

Placeholder Mixin in SCSS/CSS

Question:
How to create a mixin for placeholders in SASS that allows the passing of static CSS without syntax errors?

Answer:
To achieve seamless passing of static CSS in a placeholder mixin, we can utilize the @content directive.

Updated Mixin:

<code class="scss">@mixin placeholder {
  ::-webkit-input-placeholder {@content}
  :-moz-placeholder           {@content}
  ::-moz-placeholder          {@content}
  :-ms-input-placeholder      {@content}  
}</code>

Usage:

<code class="scss">@include placeholder {
    font-style:italic;
    color: white;
    font-weight:100;
}</code>

Advanced Mixin (Sass 3.4 and above):

For enhanced flexibility, you can use the following mixin to support both nested and unnested usage:

<code class="scss">@mixin placeholder {
  @include optional-at-root('::-webkit-input-placeholder') {
    @content;
  }

  @include optional-at-root(':-moz-placeholder') {
    @content;
  }

  @include optional-at-root('::-moz-placeholder') {
    @content;
  }

  @include optional-at-root(':-ms-input-placeholder') {
    @content;
  }
}</code>

This mixin provides a more robust placeholder approach that works across various CSS selectors and nested elements.

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