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Tag: WebDev
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Random snippets of all sorts of code, mixed with a selection of help and advice.
Problematic type-hints
20 June 2026 @ 10:32 pm
Moving on from yesterdays post about this and further to the many issues resolved with the help of @furus, here is an updated example with the remaining few type-hint errors:
from typing import Any
from wsgiref import simple_server
from wsgiref.types import StartResponse
def my_func(attributes: None | dict[str, str] = None) -> None:
attributes = attributes if not None else {}
for name, value in attributes.items():
print(name, value)
class Response:
start_response: StartResponse
def __init__(self, start_response) -> None:
self.start_response = start_response
def serve_pre_compiled(self) -> str:
local_dict = {"obj_response": self}
exec("file", {}, local_dict)
return local_dict["__HTML__"]
class MyProcess:
status: str
obj_response: Response
def __init__(self, environ: dict[str, Any], start_response: StartResponse) -> None:
_ = environ
best data architecture to scale Python
20 June 2026 @ 9:55 pm
We want to keep our ETL transformations in Python, but we are starting to hit memory limits as our data grows.
What would be the best low-cost architecture to scale Python ETLs without rewriting everything in SQL?
Databricks is not an option because it is too expensive for our company. Our largest table has around 2 million rows.
Would using Amazon S3 and storing the data in Parquet format help reduce memory usage during ETL processing? If so, how would you recommend structuring the architecture?
Node.js login doesn't work. How to fix it? [closed]
20 June 2026 @ 8:05 pm
My database isn't working how it should. Everything works except the login function. Here are my HTML and server codes.
login.html:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Diary.com - Login</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div id="header">
<p id="header-text">Diary.com</p>
</div>
<div id="main_entry">
<p id="text">Login</p>
<form action="http://localhost:3000/login" method="post">
<input id="username" name="username" type="text" maxlength="
Storage Spaces SSD (write cache) tier footprint not increasing during small/big random writes to HDD parity virtual disk
20 June 2026 @ 7:59 pm
I'm trying to build a Storage Spaces array on Windows 11 Pro for Workstations - 8 HDDs (dual parity) and 4 enterprise SAS SSDs intended as a write cache/fast tier.
I've tried two configurations:
1. Tiered pool — SSDs as Auto-Select with a separate SSD mirror tier + HDD parity tier
2. Non-tiered — SSDs set to Usage: Journal with -WriteCacheSize on the virtual disk
In both cases I can't confirm the SSDs are actually being used. I'm testing with small (64KB) random file writes and big files writes, and watching WriteCacheUsedSize and FootprintOnPool on the tiers, but values stay at 0 or don't change.
If I understand it correctly Enable-StorageBusCache and S2D features are Server-only and don't apply here.
Could anyone confirm: which configuration (tiered vs Journal or Both together) actually works for SSD caching on desktop Windows, and what's the correct way to verify its functioning?
Are there any mistakes in how I create it and/or
Apple DDM: App Reinstallation Triggered When Assets Change
20 June 2026 @ 7:16 pm
I am working with Apple DDM.
I have all declaration types configured, and they are working fine. However, I have one issue that is causing a major problem for users.
Scenario:
I install app "ABC".
Something changes, causing the asset configuration on the server to differ from what the device currently has.
The next time the device pulls assets, it detects that the server token is different. As a result, the app is removed and a confirmation dialog appears asking the user whether they want to install the app again.
This means that if I update 20 apps, all 20 apps could be removed and then require reinstallation, which creates a very poor user experience.
I could not find any "reinstall" policy or related behavior documented in Apple's DDM documentation.
Has anyone experienced a similar issue or found a way to handle this more gracefully? Any suggestion
Adding a custom column to messages in Thunderbird
20 June 2026 @ 3:47 pm
I want to add a custom numeric column to email messages in Thunderbird
I want the column to be available for me to see and change the value.
The value should be reset to blank or (-1) when messages move folders.
I'm able to attach a value to messages, but I have trouble displaying the value as a column.
The value does not come from the headers, and it should not be stored in the message headers.
How can I do this in modern Thunderbird?
Why are Z3 sexpr and string different?
20 June 2026 @ 2:05 pm
>>> conclusion
Implies(And(Not(Exists(z, R(z, e3))),
Not(Exists(z, R(z, e2)))),
And(Not(B(e3)), Not(B(e2))))
>>> conclusion.sexpr()
'(let ((a!1 (and (not (exists ((z Ent)) (R z e3)))\\n (not (exists ((z Ent)) (R z e2))))))\\n (=\> a!1 (and (not (B e3)) (not (B e2)))))'
As you can see, the string form (__str__) the variable conclusion starts with Implies, but the sexpr form starts with let.
Why are they different? When are the string form and sexpr form different?
I couldn't find any hints in the reference.
Not only me, but this presentation also notes the difference between Z3 sexpr and string, but
Best practices for SQL Beginner
20 June 2026 @ 1:55 pm
What are the best practices that saved you time when you started Data science / Data analysis for the first time?
I want to learn for the first time and don't know how to start and what are the first steps?
I have a small background in Excel only.
Why this Open3D compute_transformation produces a wrong matrix?
20 June 2026 @ 1:03 pm
This Python 3.12 script with Open3D 0.19.0 produces a wrong transformation matrix m:
import open3d as o3d, numpy as np
s = np.array([[50.7, 107.8, 2282.5], [0.7, 0.5, -0.4], [-0.0, -0.6, -0.7], [-0.6, 0.5, -0.4]], dtype='f4')
t = np.array([[0, 0, 0], [1, 0, 0], [0, 1, 0], [0, 0, 1]], dtype='f4')
source = o3d.geometry.PointCloud()
target = o3d.geometry.PointCloud()
source.points = o3d.utility.Vector3dVector(s)
target.points = o3d.utility.Vector3dVector(t)
corres = o3d.utility.Vector2iVector(np.array([[0, 0], [1, 1], [2, 2], [3, 3]]))
tf = o3d.pipelines.registration.TransformationEstimationPointToPoint()
tf.with_scaling = True
m = tf.compute_transformation(source, target, corres)
output = source.transform(m)
print(np.asarray(output.points))
Instead of this expected output:
[[ 0. -0. -0.]
[ 1. -0. -0.]
[-0. 1. -0.]
[-0. -0. 1.]]
I'm getting:
[[-0.00039798 -0.00055862 -0.00041059]
[ 0.3336
Coloring of indent spaces in VSCode
20 June 2026 @ 9:20 am
I'd like to know how to turn off or control the vertical colored area indicating indent on each line.
I've attempted to determine this from the docs, but I don't have the terminology to find the answer.
An image may help:
This is in VSCode.
The indicators I want to control:
960.gs
CSS Grid System layout guide
960.gs
IconPot .com
Totally free icons
Interface.eyecon.ro
Interface elements for jQuery
Interface.eyecon.ro
ThemeForest.net
WordPress Themes, HTML Templates.
kuler.adobe.com
color / colour themes by design
webanalyticssolutionprofiler.com
Web Analytics::Free Resources from Immeria
webanalyticssolutionprofiler.com
WebAIM.org
Web Accessibility In Mind
An Extension is Not an Excuse
28 May 2026 @ 9:20 pm
The Department of Health and Human Services recently announced a one-year extension of the compliance dates for web content and mobile app accessibility requirements under Section 504 of the Rehabilitation Act. The requirements themselves are not new in substance: covered recipients of HHS federal financial assistance must make covered web content and mobile apps conform […]
Tolerating Inaccessibility
30 April 2026 @ 5:50 pm
The latest WebAIM Million report shows that detectable homepage accessibility errors increased over the past year. This article considers what those results may reveal about the organizational and societal forces that continue to deprioritize accessibility, and challenges us to imagine a world where inaccessibility is no longer tolerated.
Ask AIMee: An accessible accessibility-focused AI chatbot
31 March 2026 @ 4:49 pm
We’re happy to introduce AIMee – an easy-to-use, AI-powered conversational chatbot focused on accessibility. AIMee has been designed to be highly accessible to users with disabilities. Ask her accessibility questions to get quick answers and guidance. The name “AIMee” plays off of the “AIM” (Accessibility In Mind) from “WebAIM” and also “AI”. Here are some […]
A New Path for Digital Accessibility?
27 February 2026 @ 7:02 pm
Please note This post will explore how an adaptive, intelligent system could empower users with disabilities to optimize their experience in digital environments. Even were such a system available tomorrow, developers of digital content, services, and products would still be responsible for providing equal access to ALL users. Consider a few of the many exciting […]
2026 Predictions: The Next Big Shifts in Web Accessibility
22 December 2025 @ 11:22 pm
I’ve lived long enough, and worked in accessibility long enough, to have honed a healthy skepticism when I hear about the Next Big Thing. I’ve seen lush website launches that look great, until I activate a screen reader. Yet, in spite of it all, accessibility does evolve, but quietly rather than dramatically. As I gaze […]
Word and PowerPoint Alt Text Roundup
31 October 2025 @ 7:14 pm
Introduction In Microsoft Word and PowerPoint, there are many types of non-text content that can be given alternative text. We tested the alternative text of everything that we could think of in Word and PowerPoint and then converted these files to PDFs using Adobe’s Acrobat PDFMaker (the Acrobat Tab on Windows), Adobe’s Create PDF cloud […]
Accessibility by Design: Preparing K–12 Schools for What’s Next
30 July 2025 @ 5:51 pm
Delivering web and digital accessibility in any environment requires strategic planning and cross-organizational commitment. While the goal (ensuring that websites and digital platforms do not present barriers to individuals with disabilities) and the standards (the Web Content Accessibility Guidelines) remain constant, implementation must be tailored to each organization’s needs and context. For K–12 educational agencies, […]
Up and Coming ARIA
30 May 2025 @ 6:19 pm
If you work in web accessibility, you’ve probably spent a lot of time explaining and implementing the ARIA roles and attributes that have been around for years—things like aria-label, aria-labelledby, and role="dialog". But the ARIA landscape isn’t static. In fact, recent ARIA specifications (especially ARIA 1.3) include a number of emerging and lesser-known features that […]
Global Digital Accessibility Salary Survey Results
27 February 2025 @ 8:45 pm
In December 2024 WebAIM conducted a survey to collect salary and job-related data from professionals whose job responsibilities primarily focus on making technology and digital products accessible and usable to people with disabilities. 656 responses were collected. The full survey results are now available. This survey was conducted in conjunction with the GAAD Foundation. The GAAD […]
Join the Discussion—From Your Inbox
31 January 2025 @ 9:01 pm
Which WebAIM resource had its 25th birthday on November 1, 2024? The answer is our Web Accessibility Email Discussion List! From the halcyon days when Hotmail had over 35 million users, to our modern era where Gmail has 2.5 billion users, the amount of emails in most inboxes has gone from a trickle to a […]
CatsWhoCode.com
Titbits for web designers and alike
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