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What Is DOM and Why Does Size Matter?
The Document Object Model (DOM) is the representation of the HTML elements on a webpage. Every tag in your HTML, such as <div>, <span>, and <img>, becomes a node in the DOM tree, which the browser must render. The larger and more complex this tree is, the longer it takes to load and process. This delay can lead to slower page load times, affecting your SEO rankings and user experience.
An excessively large DOM can:
- Increase the time it takes for the page to become interactive (Time to Interactive or TTI).
- Increase CPU usage, as browsers require more time to process the tree.
- Make troubleshooting errors harder, as you have a more complex structure to navigate.
