Created
September 2, 2020 19:43
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Lint your HTML with CSS
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/* Headers out of order (i.e. h2 before h1, etc.) */ | |
h2 ~ h1, | |
h3 ~ h1, | |
h4 ~ h1, | |
h5 ~ h1, | |
h6 ~ h1, | |
h3 ~ h2:first-of-type, | |
h4 ~ h2:first-of-type, | |
h5 ~ h2:first-of-type, | |
h6 ~ h2:first-of-type, | |
h4 ~ h3:first-of-type, | |
h5 ~ h3:first-of-type, | |
h6 ~ h3:first-of-type, | |
h5 ~ h4:first-of-type, | |
h6 ~ h4:first-of-type, | |
h6 ~ h5:first-of-type { | |
outline: 2px solid red; | |
} | |
/* Images should have an alt attribute */ | |
img:not([alt]) { | |
outline: 2px solid red; | |
} | |
/* Ensure any lists only contain `li`s as children. */ | |
ul > *:not(li), | |
ol > *:not(li) { | |
outline: 2px solid red; | |
} | |
/* Forms require `action` attributes */ | |
form:not([action]){ | |
outline: 2px solid red; | |
} | |
/** | |
* Various form-field types have required attributes. `input`s need `type` | |
* attributes, `textarea`s need `rows` and `cols` attributes and submit buttons | |
* need a `value` attribute. | |
*/ | |
textarea, | |
input{ | |
outline:5px solid red; | |
} | |
input[type]{ | |
outline:none; | |
} | |
textarea[rows][cols]{ | |
outline:none; | |
} | |
input[type=submit]{ | |
outline:5px solid red; | |
} | |
input[type=submit][value]{ | |
outline:none; | |
} | |
/* Definition lists should only contain DT and DD elements */ | |
dl > * { | |
outline:5px solid red; | |
} | |
dl > dt, | |
dl > dd { | |
outline:none; | |
} | |
/* Double-check any links whose `href` is something questionable. */ | |
a[href="#"], | |
a[href*="javascript"]{ | |
outline:5px solid yellow; | |
} | |
/* Double-check any links whose `href` missing or empty */ | |
a[href=""], | |
a:not([href]){ | |
outline:5px solid red; | |
} | |
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