Highlight.js is usually easy to lock down with Content Security Policy. The core library does not need eval, it does not need inline event handlers, and it works fine under a strict policy if you load it like a normal script. The place where people get sloppy is theming. They drop in inline <style> blocks, use broad CDN allowlists, or keep style-src 'unsafe-inline' around because syntax highlighting “needs it”. It doesn’t. ...
Water.css is the kind of CSS framework I like for security work: tiny, boring, and mostly predictable. That matters for CSP because every extra build step, inline style hack, or third-party asset is another thing you need to allow. If you’re using Water.css, your CSP can usually stay tight. Most setups only need to allow your own origin for styles, or a single CDN if you’re loading it remotely. What Water.css changes in CSP Water.css is just a stylesheet. In the normal case, CSP impact is limited to: ...
I’ve seen this pattern a lot: a team adds MapLibre GL JS to an otherwise locked-down site, ships to staging, and the map quietly explodes under Content Security Policy. No tiles. No markers. Maybe the page itself works, but the console fills up with CSP errors about workers, styles, images, and network requests. Then somebody reaches for 'unsafe-inline' or loosens connect-src to https: and calls it a day. That’s how good CSPs die. ...
I’ve seen this exact failure more than once: a docs page ships with a pretty strict Content Security Policy, someone drops in a StackBlitz embed for an interactive demo, and suddenly the page shows a blank box or a browser console full of CSP errors. The frustrating part is that nothing feels obviously broken. The iframe markup looks fine. The StackBlitz project URL loads directly in a new tab. But embedded inside your site? Dead. ...
If you’ve ever tried to lock down a frontend with Content Security Policy and then dropped in Fabric UI, you already know the pattern: the CSP gets stricter, the UI gets weird, and somebody says “just add unsafe-inline” like that doesn’t defeat half the point. Fabric UI sits in an awkward spot for CSP. Some parts play nicely enough. Other parts push you toward looser policies, especially around styles. If your goal is a hardened CSP without turning your app into a pile of exceptions, you need to know where Fabric UI helps and where it fights you. ...
NeoMagic.css is the kind of CSS framework people pick because they want speed, tiny bundles, and fewer moving parts. Good call. But once you start shipping a real app with analytics, fonts, icons, and maybe a little JavaScript sugar, your CSP usually turns into a weird mix of good intentions and emergency exceptions. I’ve seen this a lot: the app starts with a nice strict policy, then somebody adds a tag manager, then a consent banner, then inline styles sneak in, and now style-src 'unsafe-inline' is hanging around forever like a bad temporary fix. ...
Boxicons looks simple from the frontend side: drop in a stylesheet, use a class like bx bx-home, and move on. Then CSP shows up and your icons quietly disappear. I’ve seen this happen a lot because Boxicons sits in an awkward spot for CSP. It’s “just icons,” but depending on how you load it, you may need to allow a stylesheet, font files, maybe images, and sometimes a CDN you forgot you were using. If your policy is tight — which it should be — Boxicons is exactly the kind of third-party asset that gets blocked first. ...
Font Awesome is one of those libraries that looks harmless until CSP gets involved. Then suddenly half your icons disappear, the browser starts shouting about blocked fonts or styles, and somebody suggests adding https: everywhere until the warnings stop. That usually “works,” but it also guts your policy. If you’re using Font Awesome with a Content Security Policy, the failures usually come from a few predictable mistakes: allowing the CSS but not the font files allowing the kit script but not the injected styles self-hosting some assets and loading others from a CDN relying on default-src and assuming it covers everything you need fixing breakage with unsafe-inline when the real problem is somewhere else Here’s what goes wrong and how I’d fix it. ...
Reddit embeds look simple until your CSP starts blocking them. I’ve hit this a few times: product wants a Reddit post embedded on a marketing page, security wants a tight policy, and suddenly you’re trying to figure out whether you need frame-src, script-src, connect-src, or all three. The answer depends on how you embed Reddit, and that choice has real security and maintenance tradeoffs. If you’re building for a developer audience, the biggest mistake is treating “support Reddit embeds” as one CSP change. It’s not. There are a few patterns, and each one expands your policy in different ways. ...
Recharts is usually one of the easier charting libraries to live with under Content Security Policy. That’s the good news. The bad news: teams still break dashboards with CSP all the time, usually because they copy a broad policy from somewhere else, tighten it blindly, or blame Recharts for behavior caused by their own app shell, analytics, or CSS-in-JS stack. If you’re running Recharts in a React app, most CSP issues come from the environment around the charts, not the chart library itself. Recharts renders SVG. That’s a lot friendlier than libraries that depend on eval, dynamic code generation, or canvas hacks. Still, there are a few predictable ways to mess it up. ...