Fix issues with docsify.js.org and IE11

[jhildenbiddle]

Bug Report

Docsify lists IE11 as an officially supported browser. While docsify itself works fine with IE11, docsify.js.org does not load properly in IE11 due to issues with several plugins. These issues should be addressed so that the docsify website loads properly in IE11.

Steps to reproduce

1. Visit https://docsify.js.org using IE11.
2. Open IE's developer tools
3. Click on the Console tab
4. Refresh the page

What is current behaviour

Multiple JS errors displayed in console.

What is the expected behaviour

No JS errors displayed in console.

Other relevant information

Errors caused by ES6+ syntax in the following plugins:

• docsify-plugin-codefund (Issue: Breaks IE11 (which is supported by docsify v4) njleonzhang/docsify-plugin-codefund#6)
• docsify-dark-mode (Issue: Breaks IE11 (which is supported by docsify v4) Plugin-contrib/docsify-plugin#16)

Issues have been filed in repos listed above.

[jhildenbiddle]

The plugin-related issues have been resolved:

• docsify-plugin-codefund has been fixed: Breaks IE11 (which is supported by docsify v4) njleonzhang/docsify-plugin-codefund#6 (comment)
• docsify-dark-mode has been removed from https://docsify.js.org

The remaining issues are minor and cosmetic only:

1. Button background missing on coverpage

   

2. Theme color not being applied to elements (like links)

   

3. Search field placeholder text visibility is clipped

   

[jhildenbiddle]

Fixed in #1743