Html page body size

Размер body. Как это работает?

Я хочу сделать множественный фон (вода и рыба). Рыбе хочу задать определенное местоположение, например background-position: right center . Но замечаю, что это свойство не будет работать, пока не будут заданы width/height. Я задаю body width: 100% , a height: 500px . Но тем не менее height у меня отображается больше, чем указано. Почему так? И безопасно ли так делать, чтоб указать рыбе четкое местоположение.

Вот мой код *Под безопасно я имею в виду не вызовет ли такой способ каких-то лагов в будущем, когда на странице будет больше элементов и контента.

вообще предпочтительно всегда высота что бы была автоматическая не только у body но и у любых тегов в html

3 ответа 3

HTML vs. BODY: Фоновое противостояние

Очень расплывчатое описание проблемы и конечного результата. Из того, что понял — Вам нужно чётко зафиксировать позицию одного из слоёв фона («рыбка», в данном случае), чтобы независимо от размеров окна или количества контента, этот слой всегда оставался на заданной позиции (т.е. справа по центру).

Тут нужно прояснить несколько моментов:

• зависит от размеров окна и контента (width по умолчанию 100%). Следовательно, высота может меняться (если не указаны явно height и overflow), а из-за того, что позиции слоя присвоены относительные значения (right center = 100% 50%), они рассчитываются исходя из размеров элемента . Это верно, если у свойство background-attachment для нужного слоя имеет значение scroll (значение по умолчанию);
• При background-attachment: fixed; , значения позиции слоя рассчитываются исходя из размеров видимой части страницы (окна просмотра). При этом размеры элементов и игнорируются, а всё выходящее за границы этих элементов обрезается.
• Но. Если задать множественный фон непосредственно элементу и указать background-attachment: fixed; для нужных слоёв, то влияние на позиции этих слоёв будут оказывать только размеры окна просмотра. Изображения при этом не обрезаются. (При этом не забывайте явно указывать background-color для — Важно! Именно прозрачный (например: #0000, rgba(0,0,0,0) или transparent).

Запустите пример ниже. С помощью ползунка в верхнем левом углу, измените размер шрифта, чтобы содержимое начало растягивать страницу.

/* Only for demo */ document.body.insertAdjacentHTML('afterbegin','em`);" style="position: fixed;left:0;top:0;filter:drop-shadow(0 0 2px #000) drop-shadow(0 0 7px #000);">');

Lorem ipsum dolor sit amet consectetur adipisicing elit. Maxime labore possimus inventore, aut saepe et magnam! Blanditiis tenetur veniam adipisci praesentium veritatis voluptate quibusdam quo id? Veritatis fugit doloremque ab.
 
Lorem ipsum dolor sit amet consectetur adipisicing elit. Maxime labore possimus inventore, aut saepe et magnam! Blanditiis tenetur veniam adipisci praesentium veritatis voluptate quibusdam quo id? Veritatis fugit doloremque ab.
 
Это самый средний параграф.
 
Lorem ipsum dolor sit amet consectetur adipisicing elit. Maxime labore possimus inventore, aut saepe et magnam! Blanditiis tenetur veniam adipisci praesentium veritatis voluptate quibusdam quo id? Veritatis fugit doloremque ab.
 
Lorem ipsum dolor sit amet consectetur adipisicing elit. Maxime labore possimus inventore, aut saepe et magnam! Blanditiis tenetur veniam adipisci praesentium veritatis voluptate quibusdam quo id? Veritatis fugit doloremque ab.

Если захотите что-то уточнить, то напишите в комментарии под этим ответом.

Источник

HTML vs Body: How to Set Width and Height for Full Page Size

Dave Gray

CSS is difficult but also forgiving. And this forgiveness allows us to haphazardly throw styles into our CSS.

Our page still loads. There is no «crash».

When it comes to page width and height, do you know what to set on the HTML element? How about the body element?

Do you just slap the styles into both elements and hope for the best?

If you do, you’re not alone.

The answers to those questions are not intuitive.

I’m 100% guilty of applying styles to both elements in the past without considering exactly which property should be applied to which element. 🤦‍♂️

It is not uncommon to see CSS properties applied to both the HTML and body elements like this:

Does It Matter?

The above style definition creates a problem:

Setting min-height to 100% on both elements does not allow the body element to fill the page like you might expect. If you check the computed style values in dev tools, the body element has a height of zero.

Meanwhile, the HTML element has a height equal to the visible part of the page in the browser.

Look at the following screenshot from Chrome Dev Tools:

Why Does This Happen?

Using a percentage as a size value requires the element to reference a parent to base that percentage on.

The HTML element references the viewport which has a height value equal to the visible viewport height. However, we only set a min-height on the HTML element. NOT a height property value.

Therefore, the body element has no parent height value to reference when deciding what 100% is equal to.

And The Problem May Be Hidden

If you started out with enough content to fill the body of the page, you might not have noticed this issue.

And to make it more difficult to notice, if you set a background-color on both elements or even on just one of them, the viewport is full of that color. This gives the impression the body element is as tall as the viewport.

It’s not. It’s still at zero.

The image above is taken from a page with the following CSS:

Reverse-inheritance?

In a strange twist, the HTML element assumes the background-color of the body element if you don’t set a separate background-color on the html element.

So What is the Ideal Height Setting for a Full Responsive Page?

For years, the answer was the following:

This allows the HTML element to reference the parent viewport and have a height value equal to 100% of the viewport value.

With the HTML element receiving a height value, the min-height value assigned to the body element gives it an initial height that matches the HTML element.

This also allows the body to to grow taller if the content outgrows the visible page.

The only drawback is the HTML element does not grow beyond the height of the visible viewport. However, allowing the body element to outgrow the HTML element has been considered acceptable.

The Modern Solution is Simplified

This example uses vh (viewport height) units to allow the body to set a minimum height value based upon the full height of the viewport.

Like the previously discussed background-color, if we do not set a height value for the HTML element, it will assume the same value for height that is given to the body element.

Therefore, this solution avoids the HTML element overflow present in the previous solution and both elements grow with your content!

The use of vh units did cause some mobile browser issues in the past, but it appears that Chrome and Safari are consistent with viewport units now.

Page Height May Cause a Horizontal Scrollbar

Shouldn’t this say «Page Width»?

In another strange series of events, your page height may activate the horizontal scrollbar in your browser.

When your page content grows taller than the viewport height, the vertical scrollbar on the right is activated. This can cause your page to instantly have a horizontal scrollbar as well.

So What is the Fix?

You may sleep better knowing it starts with a page width setting.

This problem arises when any element — not just the HTML or body element — is set to 100vw (viewport width) units.

The viewport units do not account for the approximate 10 pixels that the vertical scrollbar takes up.

Therefore, when the vertical scrollbar activates you also get a horizontal scrollbar.

How to Set the Page for Full Width

Not setting a width on the HTML and body elements will default to the full size of the screen. If you do set a width value other than auto, consider utilizing a CSS reset first.

Remember, by default the body element has 8px of margin on all sides.

A CSS reset removes this. Otherwise, setting the width to 100% before removing the margins will cause the body element to overflow. Here’s the CSS reset I use:

How to Set Width to Your Preference

While it may not always be necessary to set a width, I usually do.

If you set the width to 100% on the body element you will have a full page width. This is essentially equivalent to not setting a width value and allowing the default.

If you want to use the body element as a smaller container and let the HTML element fill the page, you could set a max-width value on the body.

Conclusion

With no height value provided for the HTML element, setting the height and/or min-height of the body element to 100% results in no height (before you add content).

However, with no width value provided for the HTML element, setting the width of the body element to 100% results in full page width.

This can be counterintuitive and confusing.

For a responsive full page height, set the body element min-height to 100vh.

If you set a page width, choose 100% over 100vw to avoid surprise horizontal scrollbars.

I’ll leave you with a tutorial from my YouTube channel demonstrating the CSS height and width settings for an HTML page that is full screen size and grows with the content it contains:

Do you have a different way of setting the CSS width and height that you prefer?

Источник

How to get full width in body element [closed]

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How would I be able to get a website to auto-fit in the page? It’s a landscape design which needs no scrolling.

3 Answers 3

You should set body and html to position:fixed; , and then set right: , left: , top: , and bottom: to 0; . That way, even if content overflows it will not extend past the limits of the viewport.

Caveat: Using this method, if the user makes their window smaller, content will be cut off.

i having the same issue while making window smaller i don’t want the content to cut off, instead fit with respect to window height. How can I resolve that?

If its in a landscape then you will be needing more width and less height! That’s just what all websites have.

Lets go with a basic first then the rest!

The basic CSS:

Here you are using a div with id body, as:

  
 
 
 
 
 
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answered Oct 5, 2013 at 19:33 
 
 
 
 
Afzaal Ahmad ZeeshanAfzaal Ahmad Zeeshan 
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