let summaryContainer = document.getElementsByClassName('summary-container')[0];
let spans = summaryContainer.getElementsByTagName("span");
let content = Array.prototype.slice.call(spans).map(span => span.innerText)

console.log(content)

        <div class="col-50">
            <div id ="orderSummary">
                <h2>Order summary</h2>
                <div class ="summary-container">
                    <div class ="summary">
                        <div class="product">
                            <span>Natural Straight</span>
                            <div class="price">$95,00</div>
                            <div class="quantity">
                                <span>1</span>
                            </div>
                            <div class="total">$95,00 </div>
                        </div>
                    </div>
                </div>