Detect double-scrolling

[dontcallmedom]

One of the first things that qualifies a Web page as not "mobile-friendly" is when you have to scroll horizontally, and zoom on specific sections of the page.

That happens typically when:

• the page doesn't declare a viewport with <meta name="viewport" > (with values such as content="initial-scale=1.0")
• the size of the viewport implied by the said declaration is narrower that (some of) the content of the page

[gbaudusseau]

Done:

• meta viewport exist
• too much meta viewport declared
• width & initial-scale content exist
• meta viewport content (width & initial-scale) have good values
• DOM width vs width of the headless browser (smartphone) viewport
• linked l10n file with results