Heroicons are the easy case for CSP, which is nice for once. If you use Heroicons the normal way — React components, Vue components, Blade components, or copied inline SVG markup — Heroicons do not require their own domain in your Content Security Policy. There’s no Heroicons CDN you need to allow. No remote script. No remote font. Usually no remote image either. That means your CSP for Heroicons is mostly about how you render the SVGs. ...
GitHub buttons look harmless. They’re tiny. They show a star count. They make product people happy. They also pull in third-party resources, which means they touch your Content Security Policy. If your CSP is strict — and it should be — GitHub buttons are one of those “why is this blocked?” annoyances that show up late in a launch checklist. Here’s how I handle them without turning CSP into mush. ...
C3.js is handy because it gets you from raw data to charts fast. It’s also one of those libraries that tends to expose every weak spot in a sloppy Content Security Policy. I’ve seen teams lock down CSP, deploy C3.js, and then spend an afternoon wondering why the chart container stays blank while the console screams about blocked scripts or styles. Usually the breakage isn’t C3 itself. It’s the mix of D3, inline config, CDN habits, and CSS assumptions. ...
Ant Design is one of those UI libraries that looks harmless from a CSP perspective until you actually turn on a strict policy. Then things get weird fast: styles stop rendering, wave effects break, overlays look unstyled, and your console fills with CSP violations. I’ve hit this enough times that I treat Ant Design as a “plan CSP early” dependency, not a “bolt it on later” one. The main issue is styling. Depending on your Ant Design version and setup, the library may inject styles dynamically. A strict style-src can block that unless you configure nonces properly. If you’re also using server-side rendering, React hydration, analytics, and a consent manager, the policy gets more realistic than a toy default-src 'self'. ...
Material UI is one of those libraries that makes frontend teams fast and security teams nervous. The problem is simple: MUI relies on runtime-generated CSS. CSP, if you configure it properly, is hostile to runtime-generated inline styles unless you make an exception. That tension forces a choice: loosen your policy, wire up nonces correctly, or rethink how styles are injected. If you’re building with MUI, the right CSP setup depends on which styling path you’re using: ...
Evergreen by Segment is one of those tools that quietly expands your CSP over time if you’re not paying attention. You start with a neat script-src, then analytics, edge APIs, previews, and embedded UI bits show up and your policy turns into a junk drawer. This guide is the version I wish I had when wiring CSP around Evergreen on a production site. I’m assuming you want copy-paste examples first, with enough explanation to avoid breaking your app. ...
Highcharts is one of those libraries that usually works fine until you turn on a real Content Security Policy. Then the fun starts: tooltips stop rendering, exports break, inline styles get blocked, and you end up staring at DevTools wondering which directive is yelling at you this time. I’ve had better results treating Highcharts like any other third-party JavaScript dependency: start with a strict CSP, load only what you need, and loosen the policy only when you can prove why. ...
Visx is one of those rare charting libraries I actually like using. It gives you low-level control, stays close to SVG, and doesn’t drag in a giant black-box runtime. From a CSP perspective, that’s good news. The short version: Visx itself is usually CSP-friendly. It renders React components into SVG and doesn’t need eval, inline scripts, or weird dynamic code loading. Most CSP breakage around Visx comes from the app around it: tooltips, inline styles, custom HTML labels, analytics, and dev tooling. ...
Theme UI is great until you turn on a real Content Security Policy and half your styling disappears. I’ve hit this a few times with React apps that looked perfectly fine in development, then blew up the moment a stricter CSP landed in production. Theme UI makes styling ergonomic, but it also leans on runtime style injection. That’s exactly where people get tripped up. If you’re locking down a Theme UI app, the biggest mistakes usually come from treating CSP like a static checklist instead of something that has to match how your app actually renders styles and scripts. ...
Ariakit is a headless UI toolkit, which is good news for CSP. It doesn’t force a CSS-in-JS runtime, it doesn’t need eval, and it generally stays out of your way. That means you can run a pretty strict Content Security Policy without fighting your component library. The tricky part usually isn’t Ariakit itself. It’s your app shell, analytics, consent tools, inline bootstrapping scripts, and whatever your framework injects during hydration. ...