(bug): "Select all" while copying iframe to embed selects whole current page

Summary

(Summarize the bug encountered concisely)

Steps to reproduce

  1. Go to videos, and select a video.
  2. Select embed video option from the bottom part of page.
  3. an iframe will be displayed, try to select all.

Platform information

HUAWEI (HUAWEI ANE-LX1) / Android 8.0.0

Environment: Huawei P20 lite, Android 8, Chrome browser

What is the current bug behavior?

the whole page is selected, making it difficult to select the embed code.

What is the expected correct behavior?

Only iframe should be selected, so user can copy paste it to embed.

Relevant logs and/or screenshots

https://dashboard.ubertesters.com/uploads/8463/11810/issues/13/151648/select%20all%20in%20embedding.mp4

Possible fixes

(If you can, link to the line of code that might be responsible for the problem)

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