I wrote this extension to allow the use of accents (or diacritical marks) when using a UK keyboard in Chromebook. For example:
á é ã ç à ü ê
It targets the Brazilian Portuguese language, but you can change it in the source and allow it on any language.
I've tested it on Lenovo N22.
Steps to use:
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Copy the files to a folder in your Chromebook
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Go to chrome://extensions in your browser
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Make sure to check the box 'Developer mode' in the top-right
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Click 'Load unpacked extension...' and select the folder from step 1
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Go to chrome://settings/languages and add the language (in this case, Portuguese from Brazil) and choose the UK International keyboard
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If you look in the bottom right-hand corner of the screen you'll see an indicator noting which keyboard you're using. You can switch to UK International there
Happy writing-with-accents :-)
If you need a keyboard layout for Windows or MacOS, have a look here: https://sourceforge.net/projects/ukikl/