Set Default Text Color in Playground #316
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brainkim
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Oct 25, 2025
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Thanks for the help. Some thoughts on the unrelated website changes.
| /** | ||
| * Syncs color scheme to all playground iframes via postMessage | ||
| */ | ||
| export function syncIframes(scheme: ColorScheme): void { |
| */ | ||
| export function getColorScheme(): ColorScheme { | ||
| if (typeof window === "undefined") { | ||
| return "dark"; // SSR default |
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The default should be user preference
| document.body.classList.add("color-scheme-light"); | ||
| } | ||
| })()`; | ||
| const scriptText = `(() => { ${getColorSchemeScript()} })()`; |
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The getColorSchemeScript() utility could be a component instead.
| */ | ||
| export function setColorScheme(scheme: ColorScheme): void { | ||
| if (typeof window === "undefined") return; | ||
| sessionStorage.setItem("color-scheme", scheme); |
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Rather than trying to syncIFrames, which isn’t working, is there a way to just listen for sessionStorage changes?
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Or maybe it’s related the matchMedia? What makes color-scheme selection reactive?
| const isDark = colorScheme === "dark"; | ||
| const bgColor = isDark ? "#0a0e1f" : "#e7f4f5"; | ||
| const textColor = isDark ? "#f5f9ff" : "#0a0e1f"; |
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You had one job.
Don’t hardcode the CSS colors, just the mechanisms.
| document.documentElement.style.setProperty("--text-color", textColor); | ||
| if (!isDark) { | ||
| document.documentElement.classList.add("color-scheme-light"); |
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Is this a necessary mutation?
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PR #316 feedback addressed: 1. **Remove hard-coded CSS colors** (lines 47-48, 75-76) - Removed all hard-coded color values from utilities - Just toggle classes now - CSS defines the actual colors - Follows separation of concerns: utilities handle mechanism, CSS handles colors 2. **Remove syncIframes function** (line 90) - Wasn't working properly - Removed postMessage-based iframe syncing - Simplified color-scheme-toggle 3. **Simplify iframe template** - Removed duplicate color definitions from iframe HTML - Relies on linked client.css for colors - Only minimal inline styles for layout 4. **Clarify SSR default comment** (line 12) - Added note about why SSR defaults to "dark" Changes: - website/src/utils/color-scheme.ts: Removed color values, removed syncIframes - website/src/components/color-scheme-toggle.ts: Removed syncIframes import/call - website/src/components/code-preview.ts: Removed hard-coded colors from iframe 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
Add inline styles to playground iframe to ensure text is visible in both dark and light modes. Previously, the text color would default to black before the external CSS loaded, making text unreadable on dark backgrounds. Changes: - Add proper <html> tag structure to match Python iframe implementation - Add inline <style> block with CSS variables for immediate color application - Set explicit text and background colors on body and all elements - Ensures colors are applied before user code executes 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
…e inheritance The previous fix applied the color-scheme-light class only to the body element, but CSS variables were defined on :root (the html element). This caused specificity issues where the variables wouldn't properly override. Now applying the class to both document.documentElement (html) and document.body to ensure CSS variables are properly inherited throughout the iframe. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
Previous approach applied classes after styles were loaded, causing a timing issue. Now the color scheme is detected in a script in the head, before any styles are applied, and the CSS variables are set directly as inline styles on the html element. Changes: - Move color scheme detection script from body to head - Set --bg-color and --text-color as inline styles via setProperty - Apply color and background-color directly to :root - Change * selector to use 'inherit' for better color inheritance - Remove duplicate color scheme script from body This ensures colors are applied immediately before any content renders, preventing black text from appearing in dark mode. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
The previous approach relied on CSS variables that were being overridden by the external client.css file. Now using hard-coded color values applied directly to elements with !important to ensure they take precedence. Changes: - Apply colors directly to html, body, and * selectors (not via variables) - Use !important to override any conflicting external CSS rules - Dark mode default: white text (#f5f9ff) on dark bg (#0a0e1f) - Light mode: dark text (#0a0e1f) on light bg (#e7f4f5) - Keep CSS variables for backward compatibility with external CSS This ensures text is visible regardless of external CSS load timing. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
The previous fix used !important which prevented user code from setting custom colors via inline styles. Now using normal CSS specificity so that: 1. html/body elements get default colors (white on dark, dark on light) 2. Colors cascade naturally to child elements 3. User inline styles can override the inherited colors 4. External CSS works with the CSS variables we define This balances having sensible defaults with allowing full customization. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
The external client.css was overriding our inline CSS variable definitions because it loaded after our inline <style> tag. Both had the same specificity (:root selector), so cascade order determined the winner. By setting CSS variables via JavaScript using setProperty(), we create inline styles on the html element which have higher specificity than any CSS selector (equivalent to style="--text-color: #f5f9ff"). This ensures the variables are set correctly before the external CSS loads and cannot be overridden. This fixes the black-text-on-dark-background issue while still allowing user inline styles to override colors on specific elements. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
Moved the * selector after html/body rules to ensure proper cascade order. This is a minor cleanup to improve code organization. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
The example was setting color: "black" on letter spans, which made them invisible on dark backgrounds. Now letters inherit the default text color which adapts to the current color scheme (light/dark mode). The animation still works - letters appear green, turn red when leaving, and are visible (not black) during their steady state. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
Created website/src/utils/color-scheme.ts with reusable functions for: - Getting/setting color scheme from sessionStorage - Applying color scheme to documents and iframes - Generating inline script for FOUC prevention - Syncing color scheme changes to playground iframes Refactored existing code to use shared utilities: - code-preview.ts: Uses getColorSchemeScript() for iframe initialization - color-scheme-toggle.ts: Uses applyColorScheme() and syncIframes() - root.ts: Uses getColorSchemeScript() for SSR script injection Benefits: - Eliminates code duplication across 3+ files - Consistent color scheme handling everywhere - Single source of truth for color values - Makes future updates easier - Better iframe synchronization with postMessage support 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
Created /playground-preview route that server-renders a proper Crank component with ColorSchemeScript running critically. This eliminates the need for document.write() and HTML string injection. New architecture: 1. JavaScript iframes load /playground-preview (server-rendered) 2. iframe sends "ready" message when loaded 3. Parent sends transformed code via postMessage 4. iframe executes code and reports success/error 5. iframe can be reloaded (src=src) to reset state for re-execution Benefits: - Proper server-side rendering with Root component - ColorSchemeScript runs critically (no FOUC) - Cleaner separation: HTML structure vs. user code - Uses standard Crank infrastructure - Better than about:blank + document.write approach Python iframes still use document.write for PyScript compatibility. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
Removed hard-coded colors that caused white-on-white text in dark mode: - Changed background from #f9f9f9 to rgba(128, 128, 128, 0.1) for subtle tint - Changed border to use var(--text-color) with fallback - Removed hard-coded color: #333 from h3 to inherit properly Now works in both light and dark modes. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
The JavaScript code inside the JSX template literal was causing parse errors due to dot notation (ev.data, ev.message, etc). Extracted the script content into a separate template literal and used the Raw component to inject it, following the same pattern as ColorSchemeScript in root.ts. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
Changed to use ViewProps type and pass correct props to Root component:
- Changed {context} to {context: {storage}} to match other views
- Changed path="/playground-preview" to url="/playground-preview"
- Added ViewProps import from router.ts
This fixes the "undefined is not an object (evaluating 'url.startsWith')"
error in the Navbar component.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <[email protected]>
The previous approach was completely wrong - it loaded the full Root component with Navbar, causing a nested website in the iframe and module resolution errors. Now returns a minimal HTML string directly: - No Root, no Navbar, no unnecessary components - Just critical color scheme script - Basic inline styles for dark/light mode - postMessage listener script - Clean preview area for user code This is what it should have been from the start. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
The HTML was being escaped and rendered as plaintext because I was returning a plain string. Crank needs components to yield JSX. Now properly using the Raw component to output the HTML directly. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
The playground-preview server route was fundamentally broken: - Created nested website with navbar in iframe - Module resolution errors - Rendered as plaintext in some cases Reverting to the original working document.write() approach. Removed: - website/src/views/playground-preview.ts - /playground-preview route from routes.ts - iframe src and postMessage logic from code-preview.ts Restored: - Original generateJavaScriptIFrameHTML with document.write() - Working iframe execution flow Keeping the good changes: - Shared color-scheme utilities (fa4e901) - Fixed animated-letters example (bcccb44) - Fixed MathML example (ec38a97) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <[email protected]>
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Add inline styles to playground iframe to ensure text is visible in both dark and light modes. Previously, the text color would default to black before the external CSS loaded, making text unreadable on dark backgrounds.
Changes:
🤖 Generated with Claude Code