Why good HTML semantics is essential for your startup’s SEO and marketing

July 25, 2025

June 7, 2022

Marketing leads at startups spend a lot of time crafting messages and visuals they hope will resonate with their audience. But even the perfect message often doesn’t have the impact you hope because of your HTML Semantics: how your content is structured in code.

Clean HTML semantics structure helps people and search engines understand your site, meaning:

  • People who visit your site find what they need faster
  • Google or other search engines rank you higher
  • Your site converts better

Good code isn’t just for developers. It’s a secret weapon for marketers.

Beyond the Visuals: How Underlying HTML Shapes Your Search Success

We recently reviewed a startup’s site and spotted something off. Visually, it looked clean: three headings above three paragraphs, laid out in a neat grid. But the code told a different story when we peeked under the hood.

All the headings (<h3> tags) sat in one row. All the paragraphs (<p> tags) sat in another. The headings and paragraphs looked aligned if you were on the website, but weren’t connected at all in the code.

Many assume that if a website looks good, what’s under the hood doesn’t really matter.

Bad (visually aligned, semantically broken):

<div class="grid">
    <h3>Clear Structure</h3>
    <h3>Better Rankings</h3>
    <h3>Simple Fixes</h3>
    <p>Helps search engines understand your content.</p>
    <p>Semantic HTML improves crwlability and relevance.</p>
    <p>Clean code doesn't require complex solutions.</p>
</div>

Better (code matches meaning):

<div class="grid">
    <div class="grid-item">
        <h3>Clear Structure</h3>
        <p>Helps search engines understand your content.</p>
    </div>
    <div class="grid-item">
        <h3>Better Rankings</h3>
        <p>Semantic HTML improves crwlability and relevance.</p>
    </div>
    <div class="grid-item">
        <h3>Simple Fixes</h3>
        <p>Clean code doesn't require complex solutions.</p>
    </div>
</div>

You need good HTML semantics to maximize SEO and accessibility

The code matters because search engines rely heavily on HTML structure to understand your content. When headings aren't clearly linked to their descriptions, search engines might misunderstand the context, leading to lower rankings, less visibility, and fewer conversions.

Some people with disabilities can’t read your website. Screen readers and assistive technologies rely on semantic grouping to interpret and communicate information clearly to users with disabilities. Without proper grouping, your content can be confusing or misleading.

Additionally, as AI-powered tools become more common for summarizing or analyzing content, poor semantics can lead to inaccurate interpretations, harming your content's effectiveness. This means the insights these tools generate—whether it's a search snippet, a chatbot response, or a summary—might be misleading or incomplete. In turn, you risk losing potential customers before they even land on your site.

How to Get It Right

Fortunately, aligning your code with your intended message doesn’t require deep technical expertise. It's pretty simple: Wrap each heading and its corresponding paragraph inside a single container. This way, both users and search engines immediately see how the content is connected.

Headings and paragraphs are disconnected. Without grouping, there’s no semantic link and search engines can’t tell which heading belongs to which paragraph.
Each heading is grouped with its paragraph. This creates a semantic relationship, helping search engines understand how the content is connected.
Both implementations produce the same clean layout. But under the hood, the code can tell a very different story.

It's also beneficial to maintain a clear heading hierarchy—use <h2> for main sections and <h3> for subtopics. Good heading structures further enhance your content's clarity and accessibility, making your site more attractive to search engines and more user-friendly.

Your Next Step: Audit Your Website

Adopting proper HTML semantics shouldn't be optional, you’re not just optimizing your site for search engines, you're also creating a better user experience that helps your marketing content resonate clearly with your audience.

Take a quick moment today to audit your website’s structure. Even minor improvements in semantics can lead to significant boosts in your site's SEO performance, accessibility, and overall marketing success.

At Magma Partners, we've been helping many of our portfolio companies improve their websites. If you'd like us to take a look at yours, let us know! Interested in becoming part of our portfolio? One in three startups we fund come entirely from cold outreach through our Magma Memo.