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.blq-js

The CSS class blq-js is added to the html tag on capable JavaScript devices before the page starts rendering.

By prefixing CSS declarations that rely on JavaScript with .blq-js, for example .blq-js #panel2{display:none;} you can ensure your page appears without any flicker of content that should be hidded or otherwise styled differently when JS is present.

Adding your own class to the html element

If you wish to add your own class to the html element, please ensure you check for an existing class as follows:

if (typeof document.documentElement.className == "string") {
    document.documentElement.className += " yourClass";
} else {
    document.documentElement.className = "yourClass";
}

Test

Panel 2 content is hidden using .blq-js #panel2{display:none;}

• Panel 1
• Panel 2

Panel 1 (one) content

Panel 2 (two) content