Front-end development for a marketing website is a different discipline from building a web application. The goal is not the most sophisticated architecture. It is a site that loads quickly, reads beautifully on every device, works for everyone and stays easy for marketers to update for years.
Those goals are easy to agree with and surprisingly easy to miss.
Start with semantic HTML
Good front-end work starts with structure: real headings in the right order, lists that are lists, buttons that are buttons, forms with labels. Semantic HTML makes pages more accessible, easier for search engines and AI assistants to understand, and simpler to maintain.
It also prevents a lot of the most common accessibility failures. WebAIM’s 2025 analysis found detectable WCAG failures on 94.8% of the top one million home pages, dominated by issues like missing labels, empty links and empty buttons (WebAIM). Most of those are markup decisions.
Set a performance budget before you build
Performance is much easier to protect than to recover. Agree limits at the start of the project, for example:
- maximum page weight for key templates;
- a cap on third-party scripts;
- target Core Web Vitals: LCP under 2.5 seconds, INP under 200 milliseconds, CLS under 0.1.
The reason is simple: across the web, only 48% of mobile sites pass all three Core Web Vitals (HTTP Archive). Without a budget, marketing sites slowly accumulate tags, sliders and embeds until they join the other half.
Use modern CSS, and less JavaScript
Modern CSS now handles a lot of what used to require JavaScript: responsive layouts with grid and flexbox, container queries, smooth transitions, sticky elements and accessible disclosure patterns. Every script you avoid is one less thing to load, break or slow down interaction.
When interactivity is needed, keep it small, progressive and focused on the feature, not the whole page.
Build components that editors understand
The best front-end work maps cleanly to how marketers edit content. Each component, such as a hero, feature grid, testimonial or pricing table, should:
- exist as an editable module or block in the CMS;
- handle real content gracefully: long headlines, missing images, translations;
- have sensible defaults, so pages look right without design skills;
- be accessible by default, with correct headings, labels and focus states.
This is where good front-end development pays off for years. Editors can build new pages confidently, and the design system stays intact.
Choose tools for the job
Frameworks and static site generators are excellent in the right context, such as app-like features, large documentation sites or teams that already know them well. For many marketing sites, a well-built theme on HubSpot, WordPress or Webflow, or a lightweight custom front end, is faster and cheaper to maintain.
We compare those platforms in HubSpot CMS vs WordPress vs Webflow.
Where AI fits
AI tools are genuinely useful in front-end work:
- scaffolding components from a design and spec;
- writing responsive CSS variations and utility classes;
- generating structured data and meta markup;
- drafting tests and documentation.
But developers remain cautious for good reason. Stack Overflow’s 2025 survey found 46% of developers distrust the accuracy of AI output, with “almost right, but not quite” code the top frustration (Stack Overflow). In front-end work, “almost right” often means inaccessible, slow or broken on one browser. Everything should be reviewed and tested.
The takeaway
Great marketing websites are built on unglamorous fundamentals: semantic markup, a performance budget, modern CSS, accessible components and a clean editing experience. AI can speed up the work, but the fundamentals are what make a site fast, inclusive and easy to live with.
Custom front-end development is part of our website design and development service, alongside builds on HubSpot, WordPress, Webflow, Instapage and Unbounce.
For the bigger picture on vibe coding, and whether AI will replace web developers, read why developers still matter in the age of AI.
