posthtml-safe-class-names
Advanced tools
Replace escaped characters in HTML class names and CSS selectors.
Replace escaped characters in class names and CSS selectors
This plugin replaces escaped characters in class names from your <style> tags and inside class="" attributes with safe characters, that do not need escaping.
By default, it replaces:
\: and \/ with -\% with pc\. with _See the full list of replacements.
So you can use those cool Tailwind CSS selectors in HTML emails. 😎
Escaped characters in CSS selectors are not currently supported by all email clients, so you can use this plugin to replace them with HTML email-safe alternatives.
npm i posthtml posthtml-safe-class-names
Consider example.html:
<!DOCTYPE html>
<html>
<head>
<style>
.w-3\/5 {
width: 60%;
}
.bg-\[\#1da1f1\] {
background-color: #1da1f1;
}
@media (max-width: 600px) {
.sm\:w-1\/2 {
width: 50%;
}
}
</style>
</head>
<body>
<div class="w-3/5 sm:w-1/2 bg-[#1da1f1]">Lorem ipsum</div>
</body>
</html>
import posthtml from 'posthtml'
import {readFileSync, writeFileSync} from 'node:fs'
import safeClassNames from 'posthtml-safe-class-names'
const source = readFileSync('./example.html')
posthtml([
safeClassNames()
])
.process(source)
.then(result => fs.writeFileSync('./after.html', result.html))
Result:
<!DOCTYPE html>
<html>
<head>
<style>
.sm-w-3-5 {
width: 60%;
}
.bg-_1da1f1 {
background-color: #1da1f1;
}
@media (max-width: 600px) {
.sm-w-1-2 {
width: 50%;
}
}
</style>
</head>
<body>
<div class="w-3-5 sm-w-1-2 bg-_1da1f1">Lorem ipsum</div>
</body>
</html>
replacementsType: Object
Default: see list
The plugin accepts an options object where you can define character replacement mappings:
{
':': '-',
'\/': '-',
'%': 'pc',
'.': '_',
// ...
}
See the full list of replacements.
Besides adding new mappings, you can of course override the default ones.
Using the same example.html, let's replace \: in our class names with __ instead of -:
posthtml([
safeClassNames({
replacements: {
':': '__',
}
})
])
.process(source)
.then(result => writeFileSync('./after.html', result.html))
Result:
<!DOCTYPE html>
<html>
<head>
<style>
.sm__w-3-5 {
width: 60%;
}
.bg-_1da1f1 {
background-color: #1da1f1;
}
@media (max-width: 600px) {
.sm__w-1-2 {
width: 50%;
}
}
</style>
</head>
<body>
<div class="w-3-5 sm__w-1-2 bg-_1da1f1">Lorem ipsum</div>
</body>
</html>
ignoredType: Array
Default: [{heads: '{{', tails: '}}'}, {heads: '{{{', tails: '}}}'}]
An array of objects each containing heads/tails strings that mark the start and end of a class name to ignore. If a class name matches a pattern defined here, it will not be processed.
posthtml([
safeClassNames({
ignored: [
{heads: '[[', tails: ']]'},
]
})
])
.process('<div class="foo:bar [[ biz ]]">')
.then(result => console.log(result.html))
// <div class="foo-bar [[ biz ]]">
FAQs
Replace escaped characters in HTML class names and CSS selectors.
We found that posthtml-safe-class-names demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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