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This is less about left-aligned vs. left of content, but more about difference in implementation of responsive layout.

Although Youtube's left nav is left aligned, it is never far away from the main content in the center. If you increase width of your browser, number of video columns goes up to fill up gutter space. But because thumbnail size remains fixed, the width of gutter space varies.

(If you have large screen and always view your browser in full screen mode, then the gutter space will be bigger. In small resolution, the left nav collapses, but youtube provided redundant pill navigation towards the top.)

enter image description here

enter image description here

Facebook on the other hand, chose to usehas fixed-width for their main content. In orderHence, they had no choice but to avoid halvingposition it where it is. Otherwise, the left nav that is verywould be so far away from the main content on larger displays, they avoided left-aligning it.

So the short answer is, left nav should be accessible in the context of the main content. Both Facebook and Youtube fulfill this requirement, but using two different implementations.

This is less about left-aligned vs. left of content, but more about difference in implementation of responsive layout.

Although Youtube's left nav is left aligned, it is never far away from the main content in the center. If you increase width of your browser, number of video columns goes up to fill up gutter space. But because thumbnail size remains fixed, the width of gutter space varies.

(If you have large screen and always view your browser in full screen mode, then the gutter space will be bigger. In small resolution, the left nav collapses, but youtube provided redundant pill navigation towards the top.)

enter image description here

enter image description here

Facebook on the other hand, chose to use fixed-width for their main content. In order to avoid halving left nav that is very far away from the main content on larger displays, they avoided left-aligning it.

So the short answer is, left nav should be accessible in the context of the main content. Both Facebook and Youtube fulfill this requirement, but using two different implementations.

This is less about left-aligned vs. left of content, but more about difference in implementation of responsive layout.

Although Youtube's left nav is left aligned, it is never far away from the main content in the center. If you increase width of your browser, number of video columns goes up to fill up gutter space. But because thumbnail size remains fixed, the width of gutter space varies.

(If you have large screen and always view your browser in full screen mode, then the gutter space will be bigger. In small resolution, the left nav collapses, but youtube provided redundant pill navigation towards the top.)

enter image description here

enter image description here

Facebook on the other hand, has fixed-width main content. Hence, they had no choice but to position it where it is. Otherwise, the left nav would be so far away from the main content on larger displays.

So the short answer is, left nav should be accessible in the context of the main content. Both Facebook and Youtube fulfill this requirement, but using two different implementations.

1
source | link

This is less about left-aligned vs. left of content, but more about difference in implementation of responsive layout.

Although Youtube's left nav is left aligned, it is never far away from the main content in the center. If you increase width of your browser, number of video columns goes up to fill up gutter space. But because thumbnail size remains fixed, the width of gutter space varies.

(If you have large screen and always view your browser in full screen mode, then the gutter space will be bigger. In small resolution, the left nav collapses, but youtube provided redundant pill navigation towards the top.)

enter image description here

enter image description here

Facebook on the other hand, chose to use fixed-width for their main content. In order to avoid halving left nav that is very far away from the main content on larger displays, they avoided left-aligning it.

So the short answer is, left nav should be accessible in the context of the main content. Both Facebook and Youtube fulfill this requirement, but using two different implementations.