HTML: Tag nesting
Tag nesting is an important concept in HTML. You can place more than just text between HTML tags as it was before, you can also place other tags. This allows you to create a complex layout in which areas are separated from each other, e.g., the menu is separated from the header, the advertising block is separated from the main content, etc.
Some elements in HTML require some tags to be nested into other. For example, lists:
<ul>
<li>The first item in the list</li>
<li>The second item in the list</li>
</ul>
- The first item in the list
- The second item in the list
The <ul> tag is used to define the list, and this one indicates that it's a bulleted list. Inside are the <li> tags that define the elements of our list.
This kind of nesting resembles a tree, there's a treetop (the <ul> tag) and leaves (the <li> tags)
|──ul
| |──li
| |──li
Interestingly a tag with other tags inside is also called a wrapper
The tree can grow even further. The lessons about lists will show you that other lists can be placed inside list elements, and then lists can be placed inside those lists, and so on and so forth.
But there are exceptions. You can't put paragraphs within paragraphs in HTML. The example below would be incorrect:
<p>Paragraph
<p>And here's another paragraph within a paragraph</p>.
This is not a happy home for the paragraph.
</p>
In this lesson, we introduced the concept of nesting tags in HTML and examined it with the aid of bullet lists as a reminder. During this course, you'll learn both about the many situations where nesting is the best solution, and also about the tags that must not be nested within each other.
Instructions
Create a bullet list of three items. You learned about this type of list in this lesson
The exercise doesn't pass checking. What to do? 😶
If you've reached a deadlock it's time to ask your question in the «Discussions». How ask a question correctly:
- Be sure to attach the test output, without it it's almost impossible to figure out what went wrong, even if you show your code. It's complicated for developers to execute code in their heads, but having a mistake before their eyes most probably will be helpful.
In my environment the code works, but not here 🤨
Tests are designed so that they test the solution in different ways and against different data. Often the solution works with one kind of input data but doesn't work with others. Check the «Tests» tab to figure this out, you can find hints at the error output.
My code is different from the teacher's one 🤔
It's fine. 🙆 One task in programming can be solved in many different ways. If your code passed all tests, it complies with the task conditions.
In some rare cases, the solution may be adjusted to the tests, but this can be seen immediately.
I've read the lessons but nothing is clear 🙄
It's hard to make educational materials that will suit everyone. We do our best but there is always something to improve. If you see a material that is not clear to you, describe the problem in “Discussions”. It will be great if you'll write unclear points in the question form. Usually, we need a few days for corrections.
By the way, you can participate in courses improvement. There is a link below to the lessons course code which you can edit right in your browser.
Your exercise will be checked with these tests:
1const { test } = require('tests');
2
3test(({ query, querySelectorAll, expect }) => {
4 query(document, 'ul', HTMLUListElement);
5 const elements = querySelectorAll(document, 'ul > li', HTMLLIElement);
6 expect(elements).to.have.length(3);
7});
8Teacher's solution will be available in:
