It is one of the three core technologies of the web, together with Hypertext Markup Language (HTML) and Cascading Style Sheets (CSS). Each technology is responsible for a specific part of a web page’s build-up:
- HTML adds structure and organization to a page by arranging content into elements like separate paragraphs, headings, or lists
- CSS adds presentation and design, giving a page its specific style and appearance
What is rendering?
Rendering in the context of web development is the process of fetching data from a page and processing this data to produce the required output/result.
It is how programming languages are turned into understandable, structured code that, in turn, is turned into the site you see in front of you when you open a web page. This rendering process is an essential step in correctly displaying a web page to the user. See this step as interpreting the raw data.
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The indexing process of Google works in two waves: crawling and indexing, and rendering and indexing.
However, the unrendered data will already have been added to the index during the first wave of indexing. And once your web page gets stuck between these two waves, newly added content won’t be indexed by the search engine.