Last active
November 20, 2025 14:24
-
-
Save DylanPiercey/21bb73fce3063fb87365454f679e8086 to your computer and use it in GitHub Desktop.
Streaming with stylesheet links
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| import http from "node:http"; | |
| import timers from "node:timers/promises"; | |
| const css = { | |
| "/section1.css": | |
| "body { background: #111; color: #0f0; } .box { border: 2px solid #0f0; } section:nth-of-type(1) .box::before { content: 'Section 1: ' }", | |
| "/section2.css": | |
| "body { color: #0ff; } .box { border-color: #0ff; } section:nth-of-type(2) .box::before { content: 'Section 2: ' }", | |
| "/section3.css": | |
| "body { color: #f0f; } .box { border-color: #f0f; } section:nth-of-type(3) .box::before { content: 'Section 3: ' }", | |
| }; | |
| const html = [ | |
| `<!doctype html> | |
| <html> | |
| <head> | |
| <title>Streaming + blocking CSS demo</title> | |
| </head> | |
| <body> | |
| <h1>Streaming demo</h1> | |
| <p>Each section has a blocking <link rel="stylesheet">.</p> | |
| `, | |
| ` | |
| <section> | |
| <link rel="stylesheet" blocking="render" href="/section1.css"> | |
| <div class="box">should appear after /section1.css loads.</div> | |
| </section> | |
| <script> | |
| console.log("loaded script 1"); | |
| document.currentScript.previousElementSibling.append(new Text(" (script 1 loaded)")) | |
| </script> | |
| `, | |
| ` | |
| <section> | |
| <link rel="stylesheet" blocking="render" href="/section2.css"> | |
| <div class="box">should appear after /section2.css loads.</div> | |
| </section> | |
| <script> | |
| console.log("loaded script 2"); | |
| document.currentScript.previousElementSibling.append(new Text(" (script 2 loaded)")) | |
| </script> | |
| `, | |
| ` | |
| <section> | |
| <link rel="stylesheet" blocking="render" href="/section3.css"> | |
| <div class="box">should appear after /section3.css loads.</div> | |
| </section> | |
| <script> | |
| console.log("loaded script 3"); | |
| document.currentScript.previousElementSibling.append(new Text(" (script 3 loaded)")) | |
| </script> | |
| `, | |
| ` | |
| </body> | |
| </html> | |
| ` | |
| ]; | |
| const server = http.createServer(async (req, res) => { | |
| if (css[req.url]) { | |
| const assetIndex = parseInt(req.url.replace(/\D/g, ""), 10); | |
| await timers.setTimeout(1000 * assetIndex); | |
| res.writeHead(200, { "Content-Type": "text/css" }); | |
| res.end(css[req.url]); | |
| } else { | |
| res.writeHead(200, { | |
| "Content-Type": "text/html; charset=utf-8", | |
| "Transfer-Encoding": "chunked", | |
| }); | |
| res.write(html[0]); | |
| for (const chunk of html.slice(1, -1)) { | |
| await timers.setTimeout(500); | |
| res.write(chunk); | |
| } | |
| res.end(html[html.length - 1]); | |
| } | |
| }); | |
| server.listen(3000, () => { | |
| console.log("http://localhost:3000"); | |
| }); |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment