HtmlEditor

Script: HtmlEditor.ps1 (run from a folder such as C:\Scripts)
Entry point: run the script directly (opens the editor window)
Requires: Windows PowerShell 5.1 (STA) or PowerShell 7 on Windows

Overview

A lightweight WYSIWYG HTML editor written in PowerShell. It is a WPF window hosting the IE11-engine WebBrowser control — no WebView2 and no extra DLLs. You edit the page directly, using the styles the page's own CSS already defines.

Features

Style dropdown: built from the page's <style> blocks and linked local stylesheets. Offers block tags (p, h1–h6, blockquote, pre, address, div) and simple classes, plus (clear style).
Text color: 14 named swatches, a clear entry, and More... for the Windows color dialog. Custom colors stay in the list; the closed box shows the selection's color.
Point size: size box from 1 to 400 pt.
Highlighter: OneNote-style, 40-color palette (Ctrl+Alt+H); the last color is remembered.
Increase / Decrease Indent: toolbar buttons, Tab / Shift+Tab, Alt+Shift+Right / Alt+Shift+Left. List items nest and un-nest; other blocks step in 0.5 inch.
Toolbar follows the cursor: Style, Color, Size and highlight reflect the current selection.
HTML Source view: the selection carries across between editor and source in both directions.
Format: re-indents source with 4 spaces per level (html, head, body, style/CSS, pre); script and textarea contents are left alone.
Safe save: only the body is rewritten; the doctype, head and anything after </body> are kept exactly. Files are saved as UTF-8 without BOM.
File menu: New, Open, Save, Save As, Auto Save (saves about 2 seconds after the last edit). Shortcuts Ctrl+N, Ctrl+O, Ctrl+S, Ctrl+Shift+S, Ctrl+B, Ctrl+I, Ctrl+Z. Toolbar Undo covers style, color, size, highlight and indent changes.
Reliability: if an editor already ran in the same console, the next launch starts in a fresh process. Errors are logged to %LOCALAPPDATA%\HtmlEditor\HtmlEditor.log; repeated errors are counted instead of flooding the console; a circuit breaker stops a runaway timer; a recovery copy is written if the editor has to close.

Parameters

Name	Required	Default	Purpose
`Path`	No	—	HTML file to open at startup
`Diagnostic`	No	off	Write a verbose trace to the log
`InProcess`	No	off	Run in the current process (troubleshooting)

Requirements

Windows with Windows PowerShell 5.1 on an STA thread (the script relaunches itself with -STA if needed), or PowerShell 7 on Windows.
Writes FEATURE_BROWSER_EMULATION (IE11 mode) to HKCU and keeps its settings in HKCU\Software\HtmlEditor.

Usage

# Launch the editor
powershell.exe -STA -NoProfile -ExecutionPolicy Bypass -File C:\Scripts\HtmlEditor.ps1

# Open a specific file
C:\Scripts\HtmlEditor.ps1 -Path C:\Web\sample.html

# Verbose trace to the log
C:\Scripts\HtmlEditor.ps1 -Diagnostic

Known limits

Uses the legacy IE11 / MSHTML engine, so modern CSS and JavaScript may render differently.
Remote stylesheets and complex selectors (pseudo-classes, combinators, #id, @ rules) are not offered in the Style list.
Formatting is saved as inline <span style> and margin-left; IE may save colors as rgb().
Only the body is edited visually; use Source view for the head.
The selection is lost after an undo; Tab in a table cell inserts spaces.
After a fresh-process relaunch, the console returns immediately and messages go to the log.
Windows only.