Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Document that class and ID selector values must be valid CSS identifiers #34601

Merged
merged 3 commits into from
Jul 5, 2024
Merged

Document that class and ID selector values must be valid CSS identifiers #34601

Show file tree
Hide file tree
Changes from 1 commit
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
2bbdb14
Document that class and ID selector values must be valid CSS identifiers
wbamberg Jul 3, 2024
92d1ab2
Add escaping examples for class selectors
wbamberg Jul 3, 2024
0412411
Add escaping example for id selectors
wbamberg Jul 3, 2024
File filter

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
Next Next commit
Document that class and ID selector values must be valid CSS identifiers
  • Loading branch information
@wbamberg
wbamberg committed Jul 3, 2024
commit 2bbdb14c9839f75cd6af5eeab6a310a95bb5a147
44 changes: 31 additions & 13 deletions files/en-us/web/css/class_selectors/index.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -33,15 +33,30 @@ li.spacious.elegant {
.class_name { style properties }
```

Note that this is equivalent to the following {{Cssxref("Attribute_selectors", "attribute selector")}}:
Note that this is equivalent to the following [attribute selector](/en-US/docs/Web/CSS/Attribute_selectors):

```css
[class~=class_name] { style properties }
```

The `class_name` value must be a valid [CSS identifier](/en-US/docs/Web/CSS/ident).

## Examples

### CSS
### Valid class selectors

#### HTML

```html
<p class="red">This paragraph has red text.</p>
<p class="red yellow-bg">
This paragraph has red text and a yellow background.
</p>
<p class="red fancy">This paragraph has red text and "fancy" styling.</p>
<p>This is just a regular paragraph.</p>
```

#### CSS

```css
.red {
Expand All @@ -58,20 +73,23 @@ Note that this is equivalent to the following {{Cssxref("Attribute_selectors", "
}
```

### HTML
#### Result

```html
<p class="red">This paragraph has red text.</p>
<p class="red yellow-bg">
This paragraph has red text and a yellow background.
</p>
<p class="red fancy">This paragraph has red text and "fancy" styling.</p>
<p>This is just a regular paragraph.</p>
```
{{EmbedLiveSample('Examples')}}

### Result
### Invalid class selectors

{{EmbedLiveSample('Examples')}}
Class selectors must be valid CSS identifiers.

```css example-bad
.item?one {
background-color: green;
}

.123item {
background-color: green;
}
```

## Specifications

Expand Down
36 changes: 27 additions & 9 deletions files/en-us/web/css/id_selectors/index.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -22,32 +22,50 @@ The CSS **ID selector** matches an element based on the value of the element's [
#id_value { style properties }
```

Note that syntactically (but not specificity-wise), this is equivalent to the following {{Cssxref("Attribute_selectors", "attribute selector")}}:
Note that syntactically (but not specificity-wise), this is equivalent to the following [attribute selector](/en-US/docs/Web/CSS/Attribute_selectors):

```css
[id=id_value] { style properties }
```

The `id_value` value must be a valid [CSS identifier](/en-US/docs/Web/CSS/ident).

## Examples

### CSS
### Valid ID selectors

#### HTML

```html
<div id="identified">This div has a special ID on it!</div>
<div>This is just a regular div.</div>
```

#### CSS

```css
#identified {
background-color: skyblue;
}
```

### HTML
#### Result

```html
<div id="identified">This div has a special ID on it!</div>
<div>This is just a regular div.</div>
```
{{EmbedLiveSample("Examples", '100%', 50)}}

### Result
### Invalid ID selectors

{{EmbedLiveSample("Examples", '100%', 50)}}
ID selectors must be valid CSS identifiers.

```css example-bad
#item?one {
background-color: green;
}

#123item {
background-color: green;
}
```

## Specifications

Expand Down