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function paintCanvases() {
for (let canvas of document.getElementsByTagName("canvas")) {
canvas.width = 50;
canvas.height = 100;
let ctx = canvas.getContext("2d");
ctx.fillStyle = 'blue';
ctx.fillRect(0, 0, 25, 50);
ctx.fillStyle = 'green';
ctx.fillRect(25, 0, 25, 50);
ctx.fillStyle = 'red';
ctx.fillRect(0, 50, 25, 50);
ctx.fillStyle = 'yellow';
ctx.fillRect(25, 50, 50, 50);
}
}
function populateElements(imageSource) {
let images = document.getElementsByTagName("img");
for (var i = 0; i < images.length; i++)
images[i].src = imageSource;
paintCanvases();
for (let video of document.getElementsByTagName("video"))
video.poster = "support/exif-orientation-6-ru.jpg";
}