viewport元标签并不是标准，不过它是个广泛认可的惯例。
The viewport meta tag is not a standard yet, but it is a widely accepted convention.
虽然相关的国际公约和惯例已经存在，但各国在实践中对这种新型担保的认可程度和方式都有所不同。
In despite of related international treaties and practices, different courts acknowledge independent guarantee to different extent and in different way.
漠视大家都已认可的共同规则意味着对惯例的破坏。
Ignoring the Shared rules that everyone has subsequently agreed to is a violation of convention.
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