README

A lightweight Drupal module that provides user-adjustable text scaling with intelligent fallback strategies.

This module adds a small floating UI (A- / A / A+) that allows users to dynamically adjust text size across the site. It is designed to work across a wide range of themes, including those that rely on rem, em, or fixed px units.

Installation

composer require cms-alchemy/textsize-control
drush en textsize_control

Features

• Persistent text scaling via localStorage
• Three scaling strategies:
  • Root font-size scaling (preferred)
  • Class-based scaling fallback
  • Transform-based scaling (last resort)
• Automatic detection of whether scaling is effective
• Minimal UI injected on page load
• No configuration required

How It Works

The module attaches a Drupal behavior that:

1. Injects a control UI into the page (A-, A, A+)
2. Tracks the current scale and mode in localStorage
3. Applies scaling using a CSS variable (--text-scale)
4. Attempts scaling in this order:
   • Root (html { font-size })
   • Class-based (.textsize-mode-class)
   • Transform (scale())

If root scaling does not visibly affect the page, the module automatically falls back to alternative methods.