Helps designers and developers ensure that text line lengths (measure) meet their standards. Each font and layout is unique, so its up to the author to decide what measure works for their current situation, however a good 'rule of thumb' is to keep the measure between 45 and 75 characters. This will ensure your text stays readable across the various situations in which it could be read. Highlight some text, right click, and view the character count right in the tooltip.
You can Follow the below Step By Step procedure to install the 45to75 Chrome Extension to your Chrome Web browser.
It is the 45to75 Chrome extension download link you can download and install Chrome Browser.
Baseliner adds horizontal & vertical lines to help you align your grid to any website.
Click the icon in the address bar or press Alt+Shift+V to validate the current page. Results can be seen in Chrome's JS console.
Measure typographic line lengths right from the page
Extends the Developer Tools, adding a sidebar that displays information about the gradients applied to the inspected element.
A handy generator for all of your CSS3 needs from within the browser
Fast and easy way to test your responsive design in multiple viewports
Online CSS3 Code Generator With a Simple Graphical Interface
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Typography Inspector analyses the typography on your site and helps you improve it.