Normal Scripts: Unless they impact lay-out or require early access, place regular scripts in the footer to enhance page load speed. Try to avoid these types of scripts as they can have a huge impact on the Core Web Vitalsan pagespeed.Ĭritical Scripts: Scripts that are important to conversion or page interaction should be placed asynced or deferred in the head of the page Render Critical Scripts: Scripts that impact the main content of the page should be loaded render blocking in the head of the page. Best Practices and Recommendations:Ĭonsidering the different aspects of placing JavaScript in the head and footer, here are some best practices and recommendations: Less Critical Code: For scripts that do not affect page rendering or functionalities that are not required immediately upon page load, placing them in the footer can lead to better overall performance. When should you place JavaScript in the footer? Late Execution: JavaScript in the footer may lead to delayed execution of certain scripts, affecting functionalities that rely on early access to JavaScript.Avoiding Single Points of Failure (SPOFs): By loading JavaScript last, the chances of encountering SPOFs are reduced, ensuring that the rest of the page's content is visible even if JavaScript fails to load or execute.Faster Page Load: By placing JavaScript at the end of the page, the HTML content loads first, and the JavaScript executes later, resulting in a faster initial page load.Here are the pros and cons of using JavaScript in the footer: Pros: This will improve the paint speed over functionality. This will enqueue the script for download after the other element in the body like images and video's. Placing JavaScript code at the bottom of the page, just before the closing tag, has become a widely used practice. For example scripts that handle your menu or your main slider or your cookie notice should be placed in the head of the page.įeature Detection Scripts: In certain scenarios, JavaScript libraries like Modernizr, which are used for feature detection, may be required in the to detect browser capabilities early in the page's lifecycle. Important scripts: Scripts that are critical to rendering or critical to the page experience should be placed in the head of the page. When should you place JavaScript in the head? Slower Page Load: Due to the early download it competes for other imporact resources like the largest contentful paint element.
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