У вашего броузера проблема в совместимости с HTML5
1. Install Xcode
1a.Open “App Store”
1b. Search for Xcode
1c. Install and wait to finish the install
2. Activate Xcode and Xcode tools
2a. Open Xcode to finish the install components
2b. Open “Terminal” and enter this command:
xcode-select —install
2c. Open again “App Store” and install the update for “Command Line Tools”
3. Install macports
3a. In your favourite web browser search for macports or go directly to https://www.macports.org/install.php
3b. Download the file corresponding to your system version
3c. Install and wait for the install to finish
4. Install XQuartz
4a. Go to https://www.xquartz.org and download the file
4b. Install XQuartz and once is done log out and back in
5. Install MyPaint
5a. Open “Terminal” and type this commands, one at a time to be sure all goes ok:
sudo port selfupdate
sudo port install mypaint-devel
5b. Once all ports required are installed, you initiate “MyPaint” by invoking it like this:
mypaint