caption: {{!!title}} - ^^deprecated^^
created: 20141001132300000
modified: 20220704174221300
tags: [[How to apply custom styles]] $:/deprecated
title: How to apply custom styles by tag
type: text/vnd.tiddlywiki

<<.deprecated-since "5.1.16" "Custom styles by data-tags">>. Also see: [[How to apply custom styles]]

----

You can apply custom styles to tiddlers that have a particular tag by defining a CSS class with the name `tc-tagged-<Tag Name>`.

For example, to make tiddlers tagged "NightReader" appear in a special colour scheme suitable for night-time reading, [[create a stylesheet|Using Stylesheets]] defining the class `tc-tagged-NightReader` like this:

```
.tc-tagged-NightReader {
	background-color:black;
	color: orange;
	padding: 35px 35px;
}

.tc-tagged-NightReader .tc-tiddler-body {
	font-size: 1.5em;
}
```

The `tc-tagged-NightReader` class is applied to the entire tiddler and not just the tiddler text. If you want to target a smaller portion of the tiddler you can qualify the CSS selector, as is done here with `.tc-tagged-NightReader .tc-tiddler-body`.

Note that tags containing spaces or non-alphanumeric characters will be converted using URI encoding, making the generated CSS classname hard to predict. For example:

|!Tag |!Generated Class Name |
|`$:/mytag` |`tc-tagged-%24%3A%2Fmytag` |
|`Doctor Who` |`tc-tagged-Doctor%20Who` |
|`£35.23` |`tc-tagged-%C2%A335.23` |

Although ~TiddlyWiki will generate these tags, to actually use them in your css, you will need to escape the percent character in your stylesheet, like:

```
.tc-tagged-Doctor\%20Who {
    background-image: url(./tardis_back.svg);
    background-repeat: no-repeat;
    background-position: right;
    color:#FBFBFB;
}
```

A utility function is available in JavaScript to perform the conversion:

```
$tw.utils.tagToCssSelector("$:/tags/Stylesheet")
```

Generates the following output:

```
tc-tagged-\%24\%3A\%2Ftags\%2FStylesheet
```