Allyo.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Legacy doctype. Expected “<!DOCTYPE html>”.
Internal encoding declaration “us-ascii” disagrees with the actual encoding of the document (“utf-8”).
Bad value “text/html; charset=us-ascii” for attribute “content” on element “meta”: “us-ascii” is not a preferred encoding name. The preferred label for this encoding is “windows-1252”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Duplicate ID “case-study”.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The first occurrence of ID “case-study” was here.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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