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Converts style object into the corresponding CSS `style` attribute value
* Takes a style object and returns the corresponding
* attribute value. Converts camel case property names
* to proper CSS selector names.
* @param {Object} obj Map of CSS properties to values.
* @return {string} The style attribute value.
function toStyleAttribute = function(obj) {
return Object.keys(obj).map(function(key) {
// Camel case property names to CSS selector names.
return (key.replace(/([A-Z])/g, '-$1').toLowerCase()) +
':' + obj[key];
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