This editor provides basic functionalities of a code editor.
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In Solidity or JavaScript mode, an autocompletion plugin is available (Ctrl + Space).
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Increasing/decreasing the font size (Ctrl +, Ctrl -)
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In Solidity mode, you can display the gas estimation (Tools -> Display Gas Estimation). This will highlight all statements which requires a minimum amount of gas. Color turns to red if the gas required becomes important. It will also display the max execution cost of a transaction (for each function).