with open('index.html', 'r', encoding='utf-8') as f:
    content = f.read()

idx = content.find('header__logo')
print(content[max(0, idx-100):idx+500])

idx = content.find('mobile-toggle')
print("---")
print(content[max(0, idx-50):idx+1000])

idx = content.find('mobile-nav-drawer')
print("---")
print(content[max(0, idx-50):idx+1500])