CSS Selectors 

With specificity, comes great responsibility. Broad selectors allow us to be efficient, yet can have adverse consequences if not tested. Location-specific selectors can save us time, but will quickly lead to a cluttered stylesheet. Exercise your best judgement to create selectors that find the right balance between contributing to the overall style and layout of the DOM.

  • Similar to the WordPress Coding Standards for file names, use lowercase and separate words with hyphens when naming selectors. Avoid camelcase and underscores.
  • Use human readable selectors that describe what element(s) they style.
  • Attribute selectors should use double quotes around values
  • Refrain from using over-qualified selectors, div.container can simply be stated as .container

Correct:

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#comment-form {
    margin: 1em 0;
}
input[type="text"] {
    line-height: 1.1;
}

Incorrect:

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#commentForm { /* Avoid camelcase. */
    margin: 0;
}
#comment_form { /* Avoid underscores. */
    margin: 0;
}
div#comment_form { /* Avoid over-qualification. */
    margin: 0;
}
#c1-xr { /* What is a c1-xr?! Use a better name. */
    margin: 0;
}
input[type=text] { /* Should be [type="text"] */
    line-height: 110% /* Also doubly incorrect */
}
Posted in CSS

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