Question: when was css first proposed as a standard by the w3c
[{'answer': 'October 10 , 1994', 'provenance': [{'wikipedia_id': '23290197', 'title': 'Cascading Style Sheets', 'start_paragraph_id': 79, 'start_character': 44, 'end_paragraph_id': 79, 'end_character': 61, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '23290197', 'title': 'Cascading Style Sheets', 'start_paragraph_id': 79, 'start_character': 0, 'end_paragraph_id': 79, 'end_character': 460, 'bleu_score': 0.863365390220554, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8167095541610792703}, 'section': 'Section::::History.\n'}]}]