Differences between HTML and CSS site architecture

HTML and CSS are both scripting languages that are used to build websites. It is important to understand the differences between the two languages and how they work together to complete the design of your website, as both can affect the speed of your website as well as SEO.

What is HTML?

Hypertext Markup Language (HTML) is responsible for the core construction of your website. It is the standard markup language for creating websites. The main purpose of HTML is to define web document structure. HTML is then assisted by other scripting languages such as CSS and Javascript to complete the design of your website. HTML is often thought of as the “skeleton” or foundation of a website design.

What is CSS?

Once the core of your website is built out using HTML, CSS or Cascading Style Sheets is used to tweak the design and style. From changing colors, boundaries, margins, visual effects, CSS allows you to modify the page to achieve the client’s desired look. In a nutshell, the primary difference between the two languages is that HTML is used to create the website and CSS is then used to control the styling and layout of webpages.

Effects on SEO and site speed

Both languages can have major effects on SEO and site speed. Web developers need to be careful with how they utilize CSS, as some code can make the webpage “bulky” and difficult for Google to read, leading to the webpage loading slowly. Incorrectly placing header tags, or not utilizing them at all, can be a major hindrance to ranking your website in Google search results.


Gulfside Digital is based in Fort Myers, Florida. We specialize in web design as well as planning and executing marketing campaigns. From a minor website development tweak to building high converting landing pages we aim to deliver  value, transparency, and timeliness on every project.

Website Design Fort Myers

Service Areas

Fort Myers / Ft Myers Beach
Cape Coral
North Port
Port Charlotte


Web Design
Website Design
Web Development
Google My Business Listing
Search Engine Optimization
Digital Marketing
Google Ads
Facebook Ads
Social Media Marketing
Inbound Marketing
Content Marketing


HVAC and Roofing Contractors
Restaurant Website
Restaurant Marketing
Attorney Website
Lawyer Website
Law Firm Website
Plastic Surgeon
Finance Website
Financial Services
Contractor Website
Contractor Advertising
Real Estate Website
Realtor Website
Non Profit Organization Website
Roofer Website
Insurance Website
Auto Website