Use the Local Web Storage Feature
Even if you allot only a few cookies for every visitor to your site, the number burgeons to staggering proportions as the user base increases to thousands of repeat visitors. With every user's device transferring these cookies to your server when they send an HTTP request, your system gets bogged down and the bandwidth costs shoot up. The local web storage facility provided by HTML5 finds a way around this problem by storing information within the web browser of the user. This means that the information now does not need to be transmitted to your server with every HTTP request sent by the user. What is more, the code required to set this tool in motion is very simple. You can also use JSON to locally store an object.
Use the Figure Element
Websites are also built for search engines, and with Google's spiders getting smarter every day, you need to utilize every opportunity to convince the crawlers about the relevance of your site. This means that you have to also optimize the images within a webpage. The element of HTML5 lets you write appropriate (read: keyword-infused) captions for your images and semantically connect them to the respective media. This ensures that the spiders have no difficulty in indexing the image and awarding your website with a higher rank on the search engine result page.
Do Away With the Type Attribute
The more the codes you write and the lengthier they are, the more is the file size. A byte here and a byte there all add up to burden your website and slow down the loading time. So to streamline your coding files, HTML5 does away with the need to use the "type" attribute with the "link" and "script" tags. The language is powerful enough to understand that these tags refer to stylesheets and scripts respectively, and you are spared the effort of writing a few extra lines of code.