In this lesson from the "Test Guild UI Automation with Playwright" course, Artem Bondar introduces the concepts of Locators and Assertions, essential for working with Playwright. Here's what you'll learn:

1. **Introduction to Locators**:
- **Locating Web Elements**: Understand how Playwright locates web elements automatically and how to build custom locators for more stable tests.
- **Importance of Locators**: Learn why it’s crucial to grasp the architecture behind locating web elements to handle cases where automatic detection fails.

2. **HTML Basics**:
- **HTML Tags and Attributes**: Get familiar with HTML tags (e.g., `<input>`, `<div>`) and attributes (e.g., `placeholder`, `id`, `class`). Attributes can have values or not, and understanding these basics is key to building effective locators.
- **ID and Class Attributes**: Learn that IDs and classes are also considered attribute names, with class attributes potentially containing multiple values separated by spaces.

3. **HTML Example**:
- **Input Field Example**: Analyze an example of an input field HTML code to understand the structure and components, such as tags, attributes, and attribute values.

4. **Advanced HTML Concepts**:
- **Table Structure**: Explore an HTML table structure, including elements like `<tbody>`, `<tr>`, and `<td>`, and understand the use of opening and closing tags.
- **HTML Text and Properties**: Differentiate between text within HTML tags and properties. Learn why sometimes text you see on a webpage is not directly within the DOM but rather in properties.

5. **DOM Relationships**:
- **Parent, Child, and Sibling Elements**: Understand the relationships between different elements in the DOM. Elements above a key element are parents, elements below are children, and elements at the same level are siblings.
- **Nested Content**: Recognize that elements can contain nested content, indicated by three dots and a collapsible arrow in the DOM.

6. **DOM Terminology Summary**:
- **Components of the DOM**: Review the key components: HTML tags, attributes, attribute values, classes, and IDs.
- **Element Relationships**: Reinforce the understanding of parent, child, and sibling elements within the DOM structure.

By the end of this lesson, you'll have a solid understanding of the fundamental HTML terminology and relationships crucial for working with Playwright's locators. This knowledge will help you create more reliable and stable locators for your automation tests. See you in the next lesson!

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