html-eslint require-meta-viewport 
This rule enforces to use <meta name="viewport" content=".."> in the <head>.
Why?
Different browsers and devices may have default viewport settings. Explicitly setting the viewport properties using the <meta name="viewport"> tag ensures a consistent and predictable display across various platforms.
How to use
.eslintrc.js module.exports = {
rules: {
"@html-eslint/require-meta-viewport": "error",
},
}; Rule Details
Examples of incorrect code for this rule:
<html>
<head></head>
</html>
Examples of correct code for this rule:
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1" />
</head>
</html>