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How do HTML and CSS trees merge for web design?

When we browse the internet, behind every web page is an intricate construction process. Understanding how this happens can give us a new appreciation and improve our web development skills. Two of the main players in this process are HTML and CSS. Both form trees that merge to generate an actual mapping of the structure of a web page.

What does tree merging mean?

In web development, each HTML document generates a "node tree", while CSS contributes a cascade of styles. Together, they form the basis of the visual structure of a web page. This process comes from the Document Object Model (DOM) in HTML and the CSS Object Model (CSSOM) that work together to dictate how elements should be displayed on screen.

What is the layout in the browser?

After the HTML and CSS trees are combined, the next step is layout. This term refers to the precisely styled mapping that determines how the positions of boxes (containers) are organized in a web interface.

  • Elements and boxes: HTML elements are treated as nodes and when integrated with CSS, some of these nodes become container boxes, also known as parent elements. This is crucial for the visual structure of any web project.

  • Design hierarchy: For example, a header can have children as a navigation menu, representing a hierarchical structure. This is placed in a certain position with specific dimensions. From there, other elements such as the main, about and quicklinks are nested inside these boxes.

How is box mapping done?

The browser, through a rendering process, calculates where and how each element should be displayed:

  • Main boxes: elements such as navigation bars or footers, are recognized as main boxes. Within them, there may be paragraph tags, links, or any additional content.

  • On-screen positioning: This mapping not only considers data and styles, but also dimensions to ensure that everything is painted correctly to the end user.

Understanding this workflow is vital if you want to visualize the basic structure before the final rendering process on a web project. This conception of design, from the initial stages to completion, provides a solid foundation for advancing to the next level of web development. There is always something new to learn, and every day you can continue to expand your knowledge in these key areas that form the core of web creation.

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Layout


Es el proceso que determina la posici贸n y el tama帽o de cada elemento en una p谩gina web. Este le permite al navegador dibujar los elementos en pantalla de forma correcta.
.
El layout utiliza la informaci贸n del Rendering Tree para determinar el dise帽o siguiendo estos pasos:
.

  • El navegador asigna tama帽o a cada elemento en el Rendering Tree.
  • El navegador determina la posici贸n de los elementos con relaci贸n a sus elementos padre y hermanos.
  • Se aplican reglas de posicionamiento y escalado para determinar la posici贸n final en pantalla.
    .

Este proceso puede causar un gran impacto en el rendimiento de una p谩gina, especialmente en dispositivos m贸viles.

Clase 30 - Layout


Repaso de la clase


驴Qu茅 hace el navegador en el paso de Layout?

  • En este paso el navegador hace un mapeo para determinar la posici贸n y tama帽os de cada elemento del sitio web, teniendo en cuenta el rol de padre e hijo que puedan tener dichos elementos. Esto le permite al navegador mostrar de manera correcta los elementos en pantalla.

驴Qu茅 forma toman los elementos HTML cuando el navegador hace el layout?

  • De cajas.

donde esta javascript en el DOM?

Que interesante es la estructura de Layout la cual nos permite determinar la pocision y tama帽o de nuestro sitio web. Tambien le permite al sistema visualizar ese contenido.

El "layout" se refiere a la disposici贸n visual de los elementos en una p谩gina web. En el contexto de HTML y CSS, el layout se genera cuando el navegador organiza y posiciona los diferentes nodos (elementos) del documento. Estos nodos se convierten en cajas contenedoras que definen c贸mo se ver谩 la estructura de la p谩gina final. El layout es esencial para crear una experiencia de usuario visualmente atractiva y funcional.