Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: Modway MOD-5176-GRY Emily Upholstered Tufted Button Fabric Twin Headboard Size in Gray
Product description: Add elegance to your bedroom with the Emily tufted button headboard. Designed with just the right amount of grace, Emily is made from fiberboard, plywood, and soft polyester upholstering for a construction that is both lightweight and long-lasting. Perfect for contemporary and modern bedrooms, sleep soundly with a piece that imparts a sense of tranquility amidst an impressive backdrop of style. Fits twin size beds.
Product feature: 100% Polyester, TUFTED DESIGN - Classically elegant, this headboard features a timeless tufted design that adds chic sophistication to any bedroom and creates an ideal backdrop for bedding and shams of many styles., SUPERIOR CONSTRUCTION - The headboard is constructed with durable fiberboard and plywood. With a sturdy frame, this headboard is built to last through the years., FINE UPHOLSTERY - Quality polyester fabric upholsters this graceful headboard. Boasting a tranquil hue, this piece incorporates a sense of calm and relaxation, establishing an ideal room for rest., IMPECCABLE DETAIL - Adding the perfect amount of detail to this piece, the deep inset buttons allow for a beautiful tufted design that never goes out of style., STATEMENT PIECE - The perfect update for a kid's bedroom, this headboard makes an elegant statement wherever it rests thanks to its alluring characteristics and unique design
Product price: $14.19
Product brand: Modway
Target attributes: Size
Answer: attribute: size
value: twin
source: product title
attribute: size
value: twin
source: product description