Commit 94ae12f6 authored by Mike Greiling's avatar Mike Greiling

remove id collision caveat from documentation

parent 85422ea4
...@@ -141,51 +141,3 @@ in an initializer._ ...@@ -141,51 +141,3 @@ in an initializer._
### Further reading ### Further reading
- Stack Overflow: [Why you should not write inline JavaScript](http://programmers.stackexchange.com/questions/86589/why-should-i-avoid-inline-scripting) - Stack Overflow: [Why you should not write inline JavaScript](http://programmers.stackexchange.com/questions/86589/why-should-i-avoid-inline-scripting)
## ID-based CSS selectors need to be a bit more specific
Normally, because HTML `id` attributes need to be unique to the page, it's
perfectly fine to write some JavaScript like the following:
```javascript
$('#js-my-selector').hide();
```
However, there's a feature of GitLab's Markdown processing that [automatically
adds anchors to header elements][ToC Processing], with the `id` attribute being
automatically generated based on the content of the header.
Unfortunately, this feature makes it possible for user-generated content to
create a header element with the same `id` attribute we're using in our
selector, potentially breaking the JavaScript behavior. A user could break the
above example with the following Markdown:
```markdown
## JS My Selector
```
Which gets converted to the following HTML:
```html
<h2>
<a id="js-my-selector" class="anchor" href="#js-my-selector" aria-hidden="true"></a>
JS My Selector
</h2>
```
[ToC Processing]: https://gitlab.com/gitlab-org/gitlab-ce/blob/8-4-stable/lib/banzai/filter/table_of_contents_filter.rb#L31-37
### Solution
The current recommended fix for this is to make our selectors slightly more
specific:
```javascript
$('div#js-my-selector').hide();
```
### Further reading
- Issue: [Merge request ToC anchor conflicts with tabs](https://gitlab.com/gitlab-org/gitlab-ce/issues/3908)
- Merge Request: [Make tab target selectors less naive](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/2023)
- Merge Request: [Make cross-project reference's clipboard target less naive](https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/2024)
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