Selector ambiguity is a common problem in automation testing. **"strict" mode**
ensures that your selector points to a single element and throws otherwise.
Set `setStrict(true)` in your action calls to opt in.
```csharp
// This will throw if you have more than one button!
await page.ClickAsync("button", new Page.ClickOptions().setStrict(true));
```
#### 📍 New [**Locators API**](https://playwright.dev/docs/api/class-locator)
Locator represents a view to the element(s) on the page. It captures the logic sufficient to retrieve the element at any given moment.
The difference between the [Locator](https://playwright.dev/docs/api/class-locator) and [ElementHandle](https://playwright.dev/docs/api/class-elementhandle) is that the latter points to a particular element, while [Locator](https://playwright.dev/docs/api/class-locator) captures the logic of how to retrieve that element.
Also, locators are **"strict" by default**!
```csharp
var locator = page.Locator("button");
await locator.ClickAsync();
```
Learn more in the [documentation](https://playwright.dev/docs/api/class-locator).
#### 🧩 Experimental [**React**](https://playwright.dev/docs/selectors#react-selectors) and [**Vue**](https://playwright.dev/docs/selectors#vue-selectors) selector engines
React and Vue selectors allow selecting elements by its component name and/or property values. The syntax is very similar to [attribute selectors](https://developer.mozilla.org/en-US/docs/Web/CSS/Attribute_selectors) and supports all attribute selector operators.
Learn more in the [react selectors documentation](https://playwright.dev/docs/selectors#react-selectors) and the [vue selectors documentation](https://playwright.dev/docs/selectors#vue-selectors).
#### ✨ New [**`nth`**](https://playwright.dev/docs/selectors#n-th-element-selector) and [**`visible`**](https://playwright.dev/docs/selectors#selecting-visible-elements) selector engines
- [`nth`](https://playwright.dev/docs/selectors#n-th-element-selector) selector engine is equivalent to the `:nth-match` pseudo class, but could be combined with other selector engines.
- [`visible`](https://playwright.dev/docs/selectors#selecting-visible-elements) selector engine is equivalent to the `:visible` pseudo class, but could be combined with other selector engines.
```csharp
// select the first button among all buttons
await button.ClickAsync("button >> nth=0");
// or if you are using locators, you can use First, Nth() and Last
