CLAUDE.md: Mobile Noise Cancellation, Now Crystal Clear! (2026 Retrospective)

CLAUDE.md Mobile Noise Reduction, Now Crystal Clear! (2026 Retrospective)

While managing CLAUDE.md documents, I felt some content related to noise reduction in mobile environments was a bit vague. It was fine on desktop, but when viewed on mobile, it felt cluttered. So, I decided to sort it out properly this time.

Trials and Pitfalls

First, I tried various things to figure out why noise was occurring in the mobile environment.

// Example: Checking viewport CSS settings for mobile
const viewportMetaTag = document.querySelector('meta[name="viewport"]');
if (viewportMetaTag) {
  console.log('Viewport meta tag found:', viewportMetaTag.getAttribute('content'));
} else {
  console.error('Viewport meta tag not found!');
}

Even though the viewport settings were clearly correct, it looked strange on mobile. Sections I had specifically set aside for desktop were overlapping or had broken layouts on mobile.

<!-- Example: Desktop-only section -->
<div class="desktop-only">
  <h2>Content visible only on desktop</h2>
  <p>This content should be hidden on mobile.</p>
</div>

This was happening even with CSS like display: none;. After about 3 hours of struggling, I discovered that a specific CSS property was behaving unexpectedly in the mobile environment.

The Cause

In the end, the problem was due to the overflow-wrap: break-word; property. This property was the main culprit, causing long words or URLs to overflow without breaking lines on mobile screens, thus ruining the layout. It was fine on desktop, but the issue became prominent on the narrow screens of mobile devices.

The Solution

So, instead of overflow-wrap: break-word;, I used word-break: break-word;, and for the desktop-only sections, I handled them more flexibly using max-height: 0; overflow: hidden; instead of display: none;.

/* Mobile environment noise reduction and layout improvement */
.claudemd-content p,
.claudemd-content span {
  overflow-wrap: break-word; /* Original setting */
  word-break: break-word; /* Improved setting */
}

.desktop-only {
  display: block; /* Visible by default */
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-out;
}

@media (min-width: 768px) { /* For desktop */
  .desktop-only {
    max-height: none; /* Remove height constraint */
    overflow: visible;
  }
}

word-break: break-word; forces long words to break when they exceed the screen width, preventing layout issues. For desktop-only sections, I used media queries to control their visibility based on screen size.

The Result

• The mobile readability of CLAUDE.md documents has noticeably improved.
• Content now displays cleanly in both desktop and mobile environments.
• Information delivery has increased, making it easier for users to find the content they need.

Summary — How to Avoid the Same Trap

• [ ] When testing layout issues in mobile environments, carefully examine the overflow-wrap and word-break properties.
• [ ] For desktop-only content, consider using media queries with max-height and overflow: hidden; in addition to display: none;.
• [ ] When updating documents, don't overlook issues that occur only in specific environments; thoroughly verify them.