Remove undefined
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Security & Android apps: why automated testing matters

GetElastic

As of December 2018, there were over 2.6 Basically, testing is required to keep the code clean and free from all undesired issues such as undefined behavior, insecure behavior, performance-hindering issues, input bugs, and memory bugs. Android smart devices have gained tremendous popularity, leading to the pervasiveness of its apps.

Mobile 155
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Magento 2 Migration: The Most Definitive Guide On the Web (Updated for 2020)

Onilab User Guides

The number of mobile users in 2018 reached 4.57 b) Make sure content with undefined TTL is taken care of as well. By all means, Magento 2 will certainly make an SEO-specialist’s work much easier. Mobile Friendliness. No need to say mobile is on the rise. billion as per Statista and is estimated to grow up to 4.78

Magento 52
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Magento 2 Speed Optimization – The Definitive Guide for 2019

Onilab User Guides

content with undefined TTL. With the development of HTTP/2 (in 2015) and HTTP/3 ( in November 2018 ) JS bundling will no longer be relevant anyway. So basically Varnish is a trade-off between speed and reliability. Before implementing Varnish, you’ll need to take a closer look at the page code. Remember we are still in Developer mode?

Magento 58