In the evolving landscape of web development, supporting older or legacy browsers like Internet Explorer (IE) can often feel like a step back in time. Yet, for many organizations, particularly those with established internal systems or specific user demographics, the need to apply style ONLY on IE remains a critical requirement. Modern web standards have largely moved beyond IE’s quirks, but ignoring its existence can lead to significant user experience issues for those still relying on it. This deep dive will explore practical and effective methods for targeting Internet Explorer with specific CSS, ensuring your web applications maintain functionality and aesthetic consistency across all necessary platforms, even those from a bygone era of the internet.
Understanding the Landscape: Why Target IE Exclusively?
While the broader web development community has largely shifted focus to modern browsers, the necessity to apply style ONLY on IE is not an anomaly for certain sectors. Enterprises with large, established IT infrastructures often have systems built on older technologies that mandate the use of Internet Explorer. Government agencies, healthcare providers, and financial institutions, for instance, might still rely on specific web applications or internal portals that were optimized for, or even require, IE compatibility. This creates a unique challenge for developers: how to deliver a consistent, functional experience for modern browser users while simultaneously ensuring legacy systems remain operational and visually correct for their IE-bound counterparts.
The core issue stems from IE’s divergence from web standards, especially in versions prior to IE11. Features like CSS Grid, Flexbox, and even basic CSS3 properties behave differently, or are completely unsupported. This leads to broken layouts, misaligned elements, and functionality gaps that can severely impede user workflows. As a result, developers are often tasked with implementing specific stylesheets or CSS adjustments that exclusively target IE to correct these rendering discrepancies. This isn’t about advocating for IE’s continued use, but rather pragmatically addressing the realities of specific user bases and ensuring a seamless, albeit challenging, user experience.
Furthermore, some applications might have extensive JavaScript libraries or ActiveX controls that only function within the IE environment, particularly in older Windows operating systems. The decision to support IE, or to apply style ONLY on IE, is rarely a preference, but rather a strategic necessity driven by business continuity and user accessibility. According to StatCounter, while IE’s global market share is negligible today, specific corporate environments can still see significant internal usage, making targeted styling an essential part of the development lifecycle for those applications.
The Go-To Method: Conditional Comments for IE-Specific Stylesheets
The most robust and widely accepted method to apply style ONLY on IE is through the use of conditional comments. These are special HTML comments that Internet Explorer interprets as actual code, while other browsers ignore them. This allows developers to serve IE-specific stylesheets or even blocks of HTML content, ensuring that only IE processes them, preventing other browsers from encountering unnecessary or conflicting rules.
Conditional comments come in two main forms: downlevel-hidden and downlevel-revealed. The downlevel-hidden comments are standard HTML comments that IE processes specially. The downlevel-revealed comments are non-standard comments that hide content from IE but reveal it to other browsers. For targeting IE, we primarily use the downlevel-hidden type. For example, to include a stylesheet specifically for IE9 and older, you might use: . This syntax reads as “if less than Internet Explorer 10”.
To apply styles exclusively for Internet Explorer, conditional comments are the most reliable technique, allowing you to link IE-specific stylesheets that modern browsers will completely ignore. This method ensures that your primary CSS remains clean and standards-compliant, while all necessary hacks or overrides for legacy IE versions are compartmentalized within their own files, improving maintainability and performance for non-IE users.
You can target specific versions of IE, ranges, or even “any IE” using different conditional comment expressions:
