实现：
```python
from collections import Counter
def merge_computed_styles(computed_styles: list[dict[str, str]]):
counter = Counter()
for style in computed_styles:
counter.update(style.items())
return dict([pair for pair, count in counter.items() if count == len(computed_styles)])
```
在线尝试：
[https://bnu.py3.online/telegraph/computed-styles-09-18](https://bnu.py3.online/telegraph/computed-styles-09-18)