Vertex Pharmaceuticals | Home

Vertex Pharmaceuticals | Our Science | R&D Pipeline

Vertex Pharmaceuticals Italy | Home

Error 404 | Vertex

Vertex Pharmaceuticals | Leadership

Vertex Pharmaceuticals | Patients

Vertex Pharmaceuticals | Our Stories

Vertex Pharmaceuticals | Responsibility

Lists (e.g., `<ul>` or `<ol>`) should only contain list items (`<li>`) as a direct descendant 
to ensure that screen readers can accurately report the amount of items contained in the list. 

## Example

In the following example, some screen readers would say this list has two items, instead of 
four: 

```html
<ul>
    <div class="some_class">
        <li>Example 1</li>
    </div>
    <div class="some_other_class">
        <li>Example 2</li>
        <li>Example 3</li>
        <li>Example 4</li>
    </div>
</ul>
```

To fix this, you would need to remove the `<div class="some_class">` and 
`<div class="some_other_class>` elements and ensure only `<li>` list items remain.

## Further reading

The [formal specification for the list element](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/ul)
shows what is and is not permitted inside an `<ul>` and `<ol>`.

See [Technique H88](https://www.w3.org/TR/WCAG20-TECHS/H88.html) for more information.

list-not-following-semantics

January 2026

December 2025

Vertex Pharmaceuticals Inc

Title / URL	Issues
Vertex Pharmaceuticals \| Homewww.vrtx.com/en-au/	1
Vertex Pharmaceuticals \| Our Science \| R&D Pipelinewww.vrtx.com/our-science/pipeline/	1
Vertex Pharmaceuticals \| Homewww.vrtx.com/en-us/	1
Vertex Pharmaceuticals Italy \| Homewww.vrtx.com/it-it/	1
Error 404 \| Vertexwww.vrtx.com/invented-url-for-404-page	1
Vertex Pharmaceuticals \| Leadershipwww.vrtx.com/our-company/leadership/	1
Vertex Pharmaceuticals \| Patientswww.vrtx.com/patients/	1
Vertex Pharmaceuticals \| Our Storieswww.vrtx.com/stories/	1
Vertex Pharmaceuticals \| Homewww.vrtx.com/en-gb/	1
Vertex Pharmaceuticals \| Responsibilitywww.vrtx.com/responsibility/	1

Ensure lists are marked up correctly

Vertex Pharmaceuticals Inc

Where this issue has occurred