Grab selected text in Iframe and highlight it using Rangy | Its always better to hack around than...
unmark in iframe does not work as expected when it is the only element in the context · Issue #406 · julmot/mark.js · GitHub
HTML is detected as Javascript with auto highlighting on · Issue #1544 · highlightjs/highlight.js · GitHub
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html - How to highlight text within an iframe using JavaScript while PDF files are within iframe - Stack Overflow
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How to get syntax highlighting to work inside a text editor iframe? ( JavaScript, CSS) - Stack Overflow
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