Adjust your reading
Use A+ in the header to cycle between 100%, 112.5% and 125% text. Your browser zoom can enlarge it further. Use the Theme button to switch between light and dark. Preferences are saved locally when storage is available.
Keyboard and assistive technology
Use Tab to move through controls and Enter or Space to activate buttons. The first link skips to main content. Every numeric field has a label and unit; calculator results and quiz feedback are announced as they change. Visual diagrams include text explanations.
Motion preference
Metron has no essential animation or audio. The site respects your operating system’s reduced-motion preference. You can also set reduced motion here.
Printing and offline reading
Lesson print layouts include the question answers. Formula printing includes the currently filtered collection. Core pages are available offline after a successful online visit; visited lessons and activities are cached as you explore.
Scope of testing
The release test report records the checks performed. Automated checks cannot establish full accessibility conformance; assistive-technology and learner testing remain useful ongoing work.